The House Intelligence Committee held the first public hearing on questions involving actions taken by Russia to interfere with the 2016 elections in the United States, as both parties used starkly different strategies as they asked questions of the heads of the FBI and National Security Agency about that probe.

Here are some of the highlights:

1. FBI confirms Trump-Russia investigation for the first time. Many had long assumed that the FBI was investigating meddling by Russia in the 2016 U.S. elections, but today was the first time that it had been publicly announced by the FBI Director. "Our practice is not to confirm the existence of ongoing investigations," Comey said. But the FBI Director said that he had been authorized by the Justice Department to confirm that the U.S. does have a counter intelligence probe of Russia. And that includes investigating the nature of any links between individuals associated with the Trump Campaign and the Russian Government, and whether there was any coordination between the campaign and Russia's efforts," Comey added.

2. FBI and NSA reject Trump "wiretap" tweets. Adding their voices to those of top members in both parties on the House and Senate Intelligence committees, both FBI Director Comey and Admiral Mike Rogers, the head of the National Security Agency, said that they had found no evidence to support the March 4 tweets of President Trump, which charged that he had been subjected to wiretaps by President Obama. "I have no information that supports those tweets, and we have looked carefully inside the FBI," Director Comey told lawmakers. There was no ambiguity involved.

3. The White House doesn't back down on Trump "wiretap" tweets. Just a few hours after the FBI Director bluntly said there was no evidence to back up Mr. Trump's charge that he was wiretapped during the Obama Administration, the Trump White House refused to back down from the charge. White House Press Secretary Sean Spicer said there was still time for more information to come out from the investigations of the House and Senate Intelligence committees, so there was no reason to say the President had been wrong in making that claim.

4. Republicans focus not on Russia but on leaks. Republicans used most of their time in this first public hearing to zero in on who leaked information about top Trump aide Michael Flynn, and his conversations with the Russian Ambassador to the United States. Rep. Trey Gowdy (R-SC) pressed the heads of the NSA and FBI repeatedly on who knew about incidental collection of Flynn's phone calls, and who might have leaked them, naming a number of Obama Administration officials as possible suspects. The White House then used that hearing exchange to seemingly make the case that former President Obama might even have been the source of the information. It was another new theory from the White House - that did not seem to have any evidence behind it.

5. One Republican drills down into Russia efforts. While many of her colleagues focused on leaks, Rep. Ileana Ros-Lehtinen (R-FL) - who did not support President Trump during the election campaign - pushed for examples from the FBI and NSA on what the Russians actually did to upset the U.S. elections, and how it was different from the past. "We never saw in previous Presidential elections information being published on such a massive scale that had been illegally removed," said the NSA chief. FBI Director Comey said it was almost like the Russians didn't care if their actions were uncovered. "They were unusually loud," Comey said, labeling the Russian intrusions, "very noisy."

6. Comey admits the FBI kept Congress in the dark. In his testimony, FBI Director Comey said the counter intelligence investigation into Russian election meddling began back in July, but that Congressional leaders were not told of it before the elections - or even immediately after Election Day. "Why was the decision made not to brief senior Congressional leadership until recently," asked Rep. Elise Stefanik (R-NY). "Why was that decision made to wait months?" Comey said it was because of the "sensitivity of the matter." Asked who made that decision, Comey indicated it would have been made by the head of the FBI Counter Intelligence division.

7. Republicans grumble about Comey's "no comments." Members of both parties tried repeatedly to get Comey to respond to hypothetical questions that might shed some light on the investigation, but didn't get far. "I'm not going to answer," Comey said. "I'm not going to comment," he said when asked about a number of different people that Democrats wanted to talk about. Rebuffed a number of times in a quest for information, Rep. Mike Turner (R-OH) bluntly told the FBI chief that his reluctance to discuss the probe was only helping Moscow, by putting a legal cloud of investigation over the Trump Administration. As the hearing wrapped up, the Republican chairman of the panel, Rep. Devin Nunes (R-CA) also expressed some frustration with the day's developments. Right after the hearing, Nunes was repeatedly asked if President himself was under investigation - there was no firm answer on that.

8. Democrats use the hearing to lay out broader questions. While Democrats did go after the Russia-meddling matter with much more direct gusto, they also had clearly decided to use this hearing to put a number of matters on the table, to make sure they were aired to a broader audience. For example, the top Democrat on the panel, Rep. Adam Schiff (D-CA), used a chunk of his opening statement to refer to matters in the 'Steele Dossier," which emerged just before the election, a document that some had said was all false. But the fact that it received more attention today made others wonder whether parts of it had been verified along the way.

9. Not just the Trump tweets, but the British Intel story as well. Not only did today's witnesses completely reject President Trump's assertion that he was wiretapped in 2016, but the head of the National Security Agency also ridiculed the story - promoted last week by the White House - that British Intelligence had been used by the Obama Administration to wrongly monitor Trump Tower as well. Asked directly if the NSA had asked the British GCHQ to monitor Trump, Admiral Mike Rogers did not mince words. "No sir," Rogers said. "Nor would I." Rogers went on to say that agreed with other assessments that such a plan would be "ridiculous."

10. Another finger pointed at Wikileaks. While U.S. Intelligence has never publicly spelled out why it feels that Wikileaks is directly connected to Russia, there was no doubt left today that the FBI Director and others fully believe there is a link. Asked how leaked emails and more were delivered to Wikileaks, FBI Director Comey said there was an intermediary, a "cut-out" as he described it, to send information to the website, which many U.S. officials believe is nothing more than a front for Russian Intelligence. Still, others will rightfully point out that no direct links have been shown - but there is a lot of smoke.