The latest opinion polls show Americans are almost evenly split about whether President Trump should be removed from office.

A Quinnipiac survey shows 47% of Americans approve of Trump being removed, with 48% against it.

An Emerson poll shows that 51% of Americans support Trump’s removal, with 49% against. An ABC News/Washington Post survey shows that 51% of Americans are against Trump’s removal, with 45% in favor.

A survey by Fox News shows 50% of Americans in favor of removal, with 44% against. An Economist poll shows 45% of Americans support removing Trump from office, with 47% against the notion.

The polls precede Trump's legal team continuing their arguments Tuesday that there was nothing improper or illegal about Trump’s Ukraine dealings. Trump's lawyer Jay Sekulow also emphasized the significance of impeaching a president in an election year.

Senators are expected to vote Friday on whether to hear witnesses.

Former National Security Adviser John Bolton claims in a manuscript of his book that Trump withheld military aid in order to pressure Ukraine to conduct investigations of Joe Biden and other Democrats. Bolton also said that Trump has made personal favors to foreign leaders such as Turkish President Recep Erdogan and Chinese President Xi Jinping.

Additionally, there is interest in hearing from acting White House chief of staff Mick Mulvaney. During an Oct. 17 press conference, Mulvaney seemingly admitted to political reasons for withholding aid to Ukraine.

The House impeachment inquiry into Trump began on Sept. 24, resulting in his impeachment on Dec. 18.