President Donald Trump's first months on the job have been the worst of any president in U.S. history, according to noted historian and presidential biographer Douglas Brinkley.

"This is the most failed first 100 days of any president," Brinkley told the Washington Post earlier this week. "To be as low as he is in the polls, in the 30s, while the FBI director is on television saying they launched an investigation into your ties with Russia, I don't know how it can get much worse."

Indeed, FBI Director James Comey's bombshell about the agency's investigation into the Trump campaign's ties to Russia has even complicated the confirmation hearings for the president's Supreme Court pick. Democrats have been demanding that Judge Neil Gorsuch's confirmation be delayed, given the investigation.

As Sen. Elizabeth Warren (D-Mass.) tweeted:

The FBI Director testified @realDonaldTrump's campaign is under investigation for collusion w/ Russia. Lifetime court appointments can wait. — Elizabeth Warren (@SenWarren) March 21, 2017

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"There's a smell of treason in the air," Brinkley said. "Imagine if J. Edgar Hoover or any other FBI director would have testified against a sitting president? It would have been a mind-boggling event."

The Russia scandal has only continued to deepen, as an Associated Press exclusive report revealed Wednesday that former Trump campaign director Paul Manafort secretly worked with a Russian billionaire ten years ago to advance the interests of Russian President Vladimir Putin.

The revelations contradict Manafort's and the campaign's statements that he never worked for Russian interests.

While the scandal—and demand for an independent investigation—grows, the popularity of Trump's healthcare plan is tanking and his "morally obscene" budget is witnessing pushback from even his own voters. As a result, the president's approval rating has dipped to never-before-seen lows.