On the heels of allegations that President Donald Trump revealed highly classified information to Russian officials, more Americans think he should be impeached than think he shouldn't. Forty-eight percent of respondents said they would support Trump getting impeached, while 41 percent said they would oppose it, according to a survey released Tuesday by Public Policy Polling.

Trump’s approval rating also dropped yet again, to 38 percent, according to a Gallup poll released Monday. It’s the lowest approval rating for the president since April, though his all-time low came in March when his approval dropped to 35 percent.

Read: Bernie Sanders Slams Trump For Allegedly Revealing Classified Information To Russia

Compared to other president’s approval ratings measured on their 115th day, Trump had the lowest rating of the last four who were in office. President Barack Obama had a 64 percent approval rating at the same point, while President George W. Bush had a 56 percent approval rating and President Bill Clinton had a 45 percent approval rating.

GettyImages-681666932 Protesters gather outside Trump Tower in New York City the day after President Donald Trump fired FBI Director James Comey, May 10, 2017. Photo: Getty Images

Trump’s recent dip in approval rating came after reports emerged that he shared highly classified information with Russian Foreign Minister Sergei Lavrov and Ambassador Sergey Kislyak during a meeting at the White House last week. The information pertained to an ISIS plot involving laptops on airplanes and came from a secret intelligence source.

Critics said Trump’s sharing of the information potentially undermined the relationship with an indispensable information source. National security adviser H.R. McMaster said he was present during the meeting and that no classified information was revealed.

“The president and the foreign minister reviewed common threats from terrorist organizations to include threats to aviation,” said McMaster. “At no time were any intelligence sources or methods discussed and no military operations were disclosed that were not known publicly.”

Trump himself, however, said he had an “absolute right” to share facts with Russian officials.

“As President I wanted to share with Russia (at an openly scheduled W.H. meeting) which I have the absolute right to do, facts pertaining to terrorism and airline flight safety,” Trump posted on Twitter.

Trump’s approval rating has ranged from the high 30s and high 40s since he took office, the lowest overall approval of any president since Gallup began conducting surveys in 1953.

Read: Trump's Approval Rating Drops After Firing FBI Director James Comey

Speculation over whether Trump would resign or be impeached was also fueled after he fired FBI Director James Comey on May 9. Only 29 percent of Americans said they approved of his firing, according to an NBC News/Wall Street Journal poll released Sunday.

Allan Lichtman, a professor at American University who predicted Trump would become president, said he now believed Trump would be impeached before his term was officially over.

“Justice today will be realized in today’s America not through revolution, but by the Constitution’s peaceful remedy of impeachment,” Lichtman wrote in his new book, “The Case for Impeachment.”

“But only if the people demand it.”

GettyImages-683825138 President Donald Trump welcomes President Recep Tayyip Erdogan at the White House in Washington, D.C., May 16, 2017. Photo: Getty Images