WASHINGTON- The Republican-led Senate is on track to confirm Callista Gingrich as President Donald Trump's ambassador to the Vatican.

A vote on Gingrich's nomination to the post is set for Monday evening.

Callista Gingrich is the wife of former Republican House Speaker Newt Gingrich. He's a close ally of Trump's.

She's president of Gingrich Productions. Callista Gingrich was a congressional aide when she began a six-year affair with Newt Gingrich, then a married Republican congressman.

The Senate Foreign Relations Committee held Callista Gingrich's confirmation hearing in mid-July. She sought to assure skeptical Democrats on the panel that Trump wanted the United States to be an environmental leader even after pulling out of the accord aimed at combatting global warming.

Democrats have criticized Trump sharply for withdrawing from the Paris climate agreement.