House Democrats have subpoenaed President Trump's personal lawyer Rudy Giuliani for documents related to his interactions with Ukrainian officials.

The House Intelligence, Foreign Affairs and Oversight and Reform panels announced the subpoena Monday as they examine Trump's efforts to have Ukraine investigate political rival Joe Biden and his family. Giuliani assisted in that effort.

The Democrats have also requested information from three of Giuliani's associates.

The committees are investigating the matter, which was a subject of a whistleblower's complaint, as part of an impeachment inquiry against Trump.

Earlier, Senate Majority Leader Mitch McConnell says he would have "no choice" but to take up any House-approved impeachment articles against President Trump.

The Kentucky Republican tells CNBC on Monday that the Senate rules require him to do so.

"I would have no choice but to take it up," under Senate rules, says McConnell.

House Democrats are pushing for quick action on their probe into a transcript and whistleblower complaint that Trump pressured Ukraine's president to investigate Joe Biden's family. If the House approves articles of impeachment, they would go to the Senate for trial. (AP)