President Donald Trump took to Twitter early Saturday morning to accuse Barack Obama of tapping his phone during the election process, calling it a "new low."

"Terrible! Just found out that that Obama had my 'wires tapped' in Trump Tower just before the victory," the president tweeted. "Nothing found. This is McCarthyism!"

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Trump, who did not provide any evidence to back up his accusation, compared the former president’s alleged tactics to “Nixon/Watergate.” He also called Obama a “bad (or sick) guy.”

According to a Washington Post reporter, the source of Trump's accusations may be a claim by conservative radio host Mark Levin that appeared in a recent Breitbart article. Federal investigations into the Trump campaign's alleged ties to Russia have been documented by McClatchy and the New York Times for months.

In another tweet, Trump wondered whether it was legal for a sitting president to be “wire tapping” a presidential race before the election.

This is a developing story.

An Obama spokesperson released a statement Saturday afternoon to address the matter.

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Prosecutor Skandalakis has previously suggested that pursuing criminal charges against President Donald Trump may not be feasible until after he leaves office in 2029. (Craig Hudson/Politico/Bloomberg via Getty Images)

Credit: Bloomberg via Getty Images