House Republicans began taking a key procedural vote on President Trump's massive domestic policy bill late Wednesday evening, but it remains unclear if they have enough support to get the bill over the finish line.

Backbenchers in the president's party have stalled the bill over objections to welfare cuts and the national debt.

The bill would provide some $350 billion for Trump’s border and national security agenda, including $46 billion for the U.S.-Mexico border wall and $45 billion for 100,000 migrant detention facility beds, as he aims to fulfill his promise of the largest mass deportation operation in U.S. history.