Democrats said they'll seek a subpoena to force former Trump campaign manager Corey Lewandowski to answer all of their questions after he refused for the second time to respond to some inquiries about his communications with President Donald Trump.

"I answered every relevant question they had," Lewandowski told reporters after three hours of questioning behind closed doors on Thursday. But Rep. Adam Schiff, the committee's top Democrat, said it's not up to a witness "to pick and choose" what he's willing to discuss. He said Republicans are weighing the request to compel Lewandowski's testimony.

Lewandowski had balked at providing some answers in his initial, nine-hour appearance Jan. 17 before the committee, which is looking into Russian interference in the 2016 presidential campaign and whether anyone close to Trump colluded in the meddling.