David Pecker, the former publisher of the National Enquirer, was seen leaving the Manhattan District Attorney’s Office with his lawyer on Monday.

Pecker testified before the grand jury for about an hour, sources familiar with the matter told ABC News.

Pecker, who allegedly helped arrange the payment to Stormy Daniels before the 2016 election, previously spoke to the grand jury in January.

The district attorney’s office may have called Pecker to bolster Michael Cohen’s earlier testimony about the purpose of the payment.

The Manhattan grand jury weighing charges against former President Donald Trump is expected to reconvene on Monday, sources tell ABC News.

The grand jury may hear from another witness on Monday.

House Oversight Committee Chairman James Comer on Sunday defended taking the escalatory step of getting Congress involved in the Manhattan district attorney's investigation of Donald Trump by using his position to request answers from the prosecutor, Alvin Bragg.

"If Mr. Bragg wants to come in and explain to us what he what he's doing, and he makes a good explanation, he makes a good argument and we see that we're in an area where we shouldn't belong, such as the Republicans -- some of the Republican senators -- say, then we will back off," Comer, R-Ky., said on CNN. But, he added, "I don't believe that Bragg would be doing this if Donald Trump were not running for president, and that's something that we would like to ask Mr. Bragg as well."

Pushed by CNN anchor Jake Tapper, who said Bragg is investigating potential violations of state and not federal crimes, Comer said, "This is about politics. This is a presidential candidate."

Comer insisted that he would be more accepting of the investigation if it was being brought by the Department of Justice rather than a local district attorney, though he later said he wanted all "meddling" to end.

Bragg's office has signaled that they may be moving closer to a charging decision -- such as for falsifying business records, sources have said -- in relation to $130,000 that Trump paid the adult film actress Stormy Daniels during the 2016 election in order to prevent her from going public with an affair claim.

Trump denies all wrongdoing, including a relationship with Daniels.

He falsely said that he would be arrested last week and has urged protests.

-ABC News' Adam Carlson and Cheyenne Haslett

In a new letter Saturday, the Republican leaders of three powerful House committees responded to Manhattan District Attorney Alvin Bragg's rebuff of their request for documents and testimony related to the Trump probe.

Reps. Jim Jordan, James Comer and Brian Steil argued in the 8-page letter they have legislative purpose for demanding such material.

Bragg's office pushed back against the chairmen's original request on March 20, stating it would "not be intimidated by attempts to undermine the justice process."

Leslie Dubeck, Bragg’s general counsel, responded that it was "an unlawful incursion into New York's sovereignty."

In a new statement Saturday, Bragg's office said it is "not appropriate for Congress to interfere with pending local investigations."

"This unprecedented inquiry by federal elected officials into an ongoing matter serves only to hinder, disrupt and undermine the legitimate work of our dedicated prosecutors," his office said.

Read more about the GOP request for information on the Trump case here.

-ABC News' Lauren Peller

As legal experts speculate on what charges lay inside the sealed indictment ahead of former President Donald Trump's expected surrender on Tuesday afternoon, many predict that prosecutors could try out a new legal theory to justify bringing the charges.

"This could be a novel legal theory," said Kate Shaw, a law professor at Cardozo and ABC News contributor, speculating on what charges the public could see against Trump while stressing it's unknown until the indictment is unsealed.

Read more here.

-ABC News' Libby Cathey