President Donald Trump’s approval rating among Americans inched closer to his all-time low Wednesday at just 36 percent favorability. Meanwhile, disapproval of the president hit a historic high at 59 percent, according to Gallup’s daily poll. As previously reported, Trump hit an all-time favorability low of 35 percent in March, at which time Republicans failed to repeal and replace the Affordable Care Act.

Trump’s approval rating previously dipped to 36 percent earlier this month but rose to 38 percent by June 6. The increasingly low approval ratings come amid ongoing investigations into the Trump administration’s alleged ties to Russia, its decision to pull from the Paris Climate Agreement as well as the president’s decision to fire former FBI Director James Comey.

Read: Donald Trump's Approval Rating Close To All-Time Low As Impeachment Betting Odds Soar

In a string of tweets Tuesday, historian and author Kevin Kruse noted the significance of the president reaching a nearly 60 percent disapproval rating, the lowest it’s been since Trump took office. Kruse said that while Trump is only four months into his presidency, his disapproval rating is already higher than those recorded for his modern predecessors.

“The four modern presidents who *did* hit the 60% disapproval mark only did so well into their presidencies, after serious crisis or scandal,” Kruse wrote. Four presidents who included George W. Bush, George H. W. Bush, Richard Nixon and Harry S. Truman only saw disapproval ratings of 60 percent between 1200-2200 days into their presidencies, respectively. As Kruse pointed out, “Trump did it in just 143 days.”

Trump’s nearly 60 percent disapproval rating, Kruse said, is higher than those ever recorded by Gallup for Franklin D. Roosevelt, Dwight D. Eisenhower, John F. Kennedy, Lyndon B. Johnson, Gerald R. Ford, Jimmy Carter, Ronald Reagan, Bill Clinton and Barack Obama.

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Gallup’s poll results have been updated daily and were based on the reports of telephone interviews with roughly 1,500 American adults. Gallup's findings do, however, contrast with those reported by right-leaning Rasmussen Reports, which reported Wednesday that its own poll found 45 percent of “likely U.S. voters” approved of the president’s job performance, while 55 percent disapproved.

Political betting website Predictit saw record wagers on Trump’s impeachment in May. Used exclusively by registered U.S. voters, the site saw a spike in bets on a single contract titled “Will Donald Trump be Impeached In 2017?” after reports surfaced that the president fired Comey. More than 100,000 bets were placed on the contract in the 24 hour-period following the news, IBT reported at the time.