Trump reportedly told EPA head Andrew Wheeler to grant 31 waivers exempting refineries from using corn-based ethanol.
Other GOP senators share concerns about Trump's purge plans.
And Sen. Chuck Grassley said refunds are a "stupid" way of judging the GOP tax law.
The Senate majority leader reportedly apologized to Grassley, who had snapped: "I hope the next time ... I won't be interrupted."
Senate Majority Leader Mitch McConnell (R-Ky.) interrupted Sen. Chuck Grassley (R-Iowa) on the floor to announce that President Donald Trump intends to both sign the government funding bill and declare a national emergency over his border wall.
Child advocates say it's an important victory given the Trump administration's tough-on-crime rhetoric.
Language that would protect minors from being sentenced to life without parole is not included in the First Step Act.
Child advocates worry that he will fail to get a juvenile justice bill to the finish line before the year ends.
The Senate Judiciary Committee chairman said the pair may have conspired to make "false claims" about Brett Kavanaugh.
"Republicans are undermining all customs of the Senate,” one expert said.
The chairman quickly walked back his remark by saying women in the Senate work "harder than the average man."
Sens. Susan Collins and Jeff Flake are among those who haven't said how they'll vote on the Supreme Court nominee.
The back-and-forth comes as the FBI investigates several claims of sexual misconduct against the Supreme Court nominee.
One mental health expert said it would be "inappropriate" for senators to view all of Ford's records.
Senate Republicans released a letter from Dennis Ketterer, a former weatherman, making claims about Julie Swetnick's sexual preferences.