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.

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.

Scott Bessent said the tax-cut bill would spur economic growth, despite analysts and some Republicans warning it would add trillions to the government's debt.