The Republican-controlled U.S. Congress on Sunday sought to push forward with President Donald Trump's sweeping tax-cut bill, as one of his top economic officials dismissed Moody's decision to strip the federal government of its top-tier credit rating.

The fight has pitted the GOP's top tax writer against a determined bloc of House Republicans from high-tax states. It has also created divisions between the pro-SALT Republicans.

Moody's downgrade of the U.S. sovereign credit rating has elicited mixed responses among Republicans in Congress, with some questioning the motive behind the change and others depicting it as a warning that lawmakers should heed as they wrestle with a sweeping tax and budget bill.