2. How did Fox News get hold of private texts between Senator Mark Warner, above left, the top Democrat on the Senate Intelligence Committee, and a lawyer linked to Russia?

The committee has concluded that Republicans on the House Intelligence Committee leaked them.

Mr. Warner and his Republican counterpart, Senator Richard Burr, above right, were so perturbed by the leak that they went to House Speaker Paul Ryan and expressed concerns about the direction of the committee under Representative Devin Nunes.

The messages show that Mr. Warner sought to meet with Christopher Steele, the former British spy behind a dossier of salacious claims about President Trump’s connections to Russia.