U.S. Senate rejects a subpoena for Mulvaney

As the third impeachment trial in U.S. history got underway, senators earlier voted along party lines, 53-47, to block three separate motions from Democratic leader Chuck Schumer to subpoena records and documents from the White House, the State Department and the Office of Management and Budget related to Trump's dealings with Ukraine.

Democrats have called on the Senate to remove Trump from office for pressuring Ukraine to investigate former Democratic Vice President Joe Biden, a political rival, and then impeding the inquiry into the matter.

Trump, who was impeached last month by the Democratic-led House of Representatives on charges of abusing power and obstructing Congress, denies any wrongdoing and describes his impeachment as a partisan hoax to derail his 2020 re-election effort.