While President Barack Obama talks immigration in Texas, he faces a slew of new threats from conservatives back in Washington.

House Republicans, led by Speaker John Boehner, are putting the final touches on a lawsuit against the president over his administration's use of executive action. (Via Getty ImagesFox News)

Plus, calls from the right to impeach Obama are getting louder, with six prominent Republican figures joining conservative talk show pundits in raising the specter of impeachment. (Via Getty Images,ABC)

But while these challenges are sure to cause big headaches for the White House, it's also bringing big money for the Democratic Party ahead of a contentious midterm election. Here's an example... (Via Getty Images)

Former Alaska Gov. Sarah Palin joined the list of Republican firebrands calling for impeachment when she penned an op-ed for Breitbart.com earlier this week.

“The many impeachable offenses of Barack Obama can no longer be ignored. If after all this he’s not impeachable, then no one is.”

The result of Palin's piece: an apparent flood of grass-roots and small dollar donations to the Democratic Party, according to the Democratic Congressional Campaign Committee.

The DCCC sent emails to supporters and the media with headlines like "Palin HUMILIATED." The committee claims it received nearly 10,000 donations in less than 24 hours — double the normal rate.

A spokesperson told Politico: "Republican overreach continues to be a huge motivating factor for our grass roots. The response to impeachment has been well over six figures."

He went on to say the committee is now just short of the $3 million fundraising goal it set after Boehner announced the House's lawsuit against the administration last month.

Boehner revealed this week that litigation will focus on the president's unilateral changes to the health care law, which will delay the employer mandate until 2015. (Via The Washington Post)

JOHN BOEHNER: "This isn't about me suing the president. What we're talking about here are places where the president is basically re-writing law to make it fit his own needs." (Via CNN)

CNN explains White House officials are "scratching their heads" over the House's lawsuit. "That's because, as one senior administration official pointed out ... those same lawmakers voted to do the exact same thing."

While Boehner and other top Republicans have brushed off the idea of impeaching Obama in favor of the lawsuit, a writer for The Daily Beast explains the notion has become the latest purity test for conservatives.

But he also writes: "Although the nation was captivated by the swirling [Clinton] scandal [in 1998], the Republicans overreached with the impeachment proceedings, and the resulting backlash led to smaller-than-expected Republican gains in the midterm elections."

White House Press Secretary Josh Earnest dismissed the House lawsuit as a political stunt. (Via Getty Images)

The White House has not released an official response on the latest calls for Obama's impeachment.