House and Senate lawmakers say they'll begin working Monday on compromise tax-overhaul legislation—just a couple days after President Donald Trump introduced uncertainty over a provision that could mean a difference of about $200 billion over 10 years.

On Saturday, Trump said the corporate tax rate—which would be cut to 20% from 35% in both the House and Senate bills—"could be 22 (percent) when" a final bill emerges.

Trump's comments—made quickly to reporters as he left the White House Saturday for a political fundraising trip—imposed an air of unpredictability over congressional negotiations that are due to begin with the formation of a House-Senate "conference committee" Monday. Lawmakers will have significant differences to hammer out. But if all goes well, an agreed upon bill could be on Trump's desk "within 10 days," Republican Sen. David Perdue of Georgia said Sunday on Fox's "Sunday Morning Futures."