The Senate version would have a more substantial impact on the U.S. deficit, according to the CBO. It would add $3.3 trillion to the nation’s debt over a decade, compared with the House bill, which would add $2.4 trillion, the nonpartisan budget scorekeeper found before the final changes were made to the Senate bill.

The debate within President Donald Trump's Republican Party over a massive tax-cut and spending bill returns to the House of Representatives on Wednesday, as party leaders try to overcome internal divisions and meet a self-imposed July 4 deadline.

Senate Republicans employ an unusual accounting tactic to push Trump's tax bill forward, sparking concerns over national debt and the integrity of the Senate filibuster.