GOP Sens. Mike Lee (Utah) and Rand Paul (Ky.) have already voiced their support for the measure, and Kaine says about eight more Republicans, including Sens. Susan Collins (Maine), Lisa Murkowski (Alaska), Todd Young (Ind.) and Mitt Romney (Utah), are reviewing it.

“Probably about 10,” Kaine said when asked about the number of Republicans who could vote to rein in Trump’s powers. “There’s good discussion going on.”

Lee said several Republicans are carefully weighing whether to back the measure, adding that it “would not be unreasonable to say that there might be a group of 10 who should be considered potential candidates to vote for it.”

Democrats can force a vote on the measure at any time, but Senate Minority Leader Charles Schumer (D-N.Y.) on Monday said a vote will happen later in the week.