U.S. Sen. Chuck Grassley said Wednesday he intends to call former Trump campaign manager Paul Manafort to testify before the Senate Judiciary Committee, and will subpoena him if necessary.

“We’re working very close on this and we’ve already agreed that we’re going to bring Manafort before our committee,” Grassley said in a press call with Iowa reporters, describing his cooperation with U.S. Sen. Dianne Feinstein, the ranking Democrat on the committee.

Grassley, a Republican, is chairman of the Judiciary Committee.

Grassley said he wants to question Manafort regarding enforcement of the Foreign Agent Registration Act. But, he acknowledged, once Manafort comes before the committee he could be questioned on anything — including his presence in a June 2016 meeting involving Donald Trump Jr. and Russian attorney Natalia Veselnitskaya.

“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.

But, Iowa's senior senator continued, the meeting with Veselnitskaya and the broader question of Trump campaign collusion with the Russian government could certainly be raised.

“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,” Grassley said.

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In a statement released later Wednesday afternoon, a spokesman clarified that Grassley and Feinstein would work with Robert Mueller, the special counsel investigating Russian interference in the election, before compelling Manafort to testify.

"The Judiciary Committee is in the process of working with Special Counsel Mueller to ensure that such an action would not conflict with any criminal investigation," Grassley spokesperson Taylor Foy said in the statement. "If conflicts exist, then Chairman Grassley is prepared to work with Special Counsel Mueller to find a way for the committee to proceed with its oversight responsibility."