President Trump's former campaign manager has volunteered to speak to members of Congress investigating Russian election interference.

FOX's Rachel Sutherland reports from Washington:

Paul Manafort, who managed the President's campaign for six months in 2016, has offered to go before the House Intelligence Committee to answer questions related to the Russia investigation.

Republican chairman Devin Nunes says they're working out whether Manafort's testimony will take place in public or behind closed doors:

(Nunes) "Our lawyers, Republicans and Democrats will work with his lawyers to see what exactly he wants to do."

Nunes also canceled a public hearing next week, which upset Ranking Democrat Adam Schiff, who said Republicans are trying to keep Americans in the dark about the investigation.

In Washington, Rachel Sutherland, FOX News.

Follow Rachel Sutherland on Twitter: @SutherlandFOX