President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's approval rating held at 45 percent amid explosive testimony from his former lawyer Michael Cohen Michael Dean CohenA huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr Eric Trump says he will comply with New York AG's subpoena only after Election Day MORE and newly launched Democratic probes, according to a new poll.

In the latest Hill-HarrisX survey, 45 percent of registered voters said they approved of the president's job performance, while 55 percent said they disapproved. Those percentages are unchanged from the most recent survey, conducted Feb. 20.

"President Trump's job approval is like magnetic north, it may move a little bit around the globe but you can still navigate by it," B.J. Martino, a Republican pollster with the Tarrance Group, said Wednesday on Hill.TV's "What America's Thinking."

The president's approval rating does not appear to have been affected by recent allegations from Cohen that Trump engaged in criminal acts before becoming president. Meanwhile, House Democrats this week announced that they would be expanding their oversight investigations of the administration.

The stability in Trump's job approval rating seems to be related to the economy, where voters have consistently given him good marks, according to Martino. He noted that the president's approval numbers could slide if the economy weakens or special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE makes some major revelations.

"It has to be either the investigation coming to a head there ... or something significant happening in the economy, which is the one thing that continues to buoy the president's numbers upward," he said.

A Gallup poll released Tuesday found that 56 percent of adults surveyed said they approved of Trump's handling of the nation's economy, the highest so far of his presidency. The same survey found that 43 percent of respondents approved of Trump's overall job performance.

"Another signature aspect of Trump's presidency is despite the fact that the economy is doing pretty well in most people's view, he gets much higher approval ratings on the economy, it's not really dragging up his overall approval rating," Ruy Teixeira, a senior fellow at the Center for American Progress told "What America's Thinking" host Jamal Simmons.

The latest Hill-HarrisX poll was conducted March 5-6 among 1,001 registered voters and has a sampling margin of error of 3.1 percentage points.

—Matthew Sheffield