President Donald Trump's son-in-law and aide, Jared Kushner, will be questioned by a US committee investigating alleged ties between the Trump team and Moscow.
Mr Kushner has volunteered to speak to the Senate Intelligence Committee, the White House said.
It is examining Russia's alleged interference in last year's election.
The US intelligence community believes alleged Russian hacking during the presidential election was done to help Mr Trump defeat Hillary Clinton.
Russia denied the allegations and President Trump has branded the story "fake news".
There are two congressional investigations into the issue, plus an FBI one.
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The Senate committee wants to question him about two meetings he allegedly arranged with senior Russians, officials told the New York Times.
But staff of Mr Kushner, who was a senior adviser to Mr Trump during the election campaign, have said that so far his offer to be questioned has not been answered.
White House spokesman Sean Spicer said that Mr Kushner has not invoked executive privilege, and will testify because his job with the campaign was to be a "conduit to leaders".
"That was his role and he wants to makes sure that he's very clear about the role that he played, who he talked to, and that's it," Mr Spicer said on Monday.