The chairman of the Senate Judiciary Committee on Wednesday said he plans to call Paul Manafort, President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's former campaign chairman, to testify before his panel.

Sen. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE (R-Iowa) told reporters he would subpoena Manafort if necessary to ask him about his compliance with the Foreign Agent Registration Act (FARA), according to the Des Moines Register.

Manafort retroactively registered as a foreign agent under FARA last month, revealing his firm had worked for a Ukrainian political party between 2012 and 2014.

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"My motive for bringing him to the committee is because of other involvements with whether or not the Foreign Agent Registration Act has been adequately enforced by this administration and by the Obama administration because I think it’s been lackadaisical enforcement and he would be an example of that lackadaisical enforcement,” Grassley said.

Grassley said he's working closely on the matter with Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (Calf.), the ranking Democrat on the committee, and they've "already agreed" that they should bring Manafort in.

The Iowa senator said the committee may also question Manafort about his presence at a June 2016 meeting with Donald Trump Jr. and a Russian attorney and on the wider allegations of possible collusion between the Trump campaign and the Russian government during the 2016 presidential election.

“If he comes before our committee — and we’ll subpoena him if necessary — then … obviously it’d be appropriate for anybody to get into anything that went on at that meeting, since he was at that meeting,” he said.

Manafort's campaign activities are likely part of the ongoing probe into Russian interference in the presidential race, led by Justice Department special counsel Robert Mueller.