Sen. John Cornyn said a tightening presidential race has helped incumbents.
Sen. Grassley said the FBI is keeping a "vice grip" on information about the investigation.
The program is set to expire on Sept. 30.
John Cornyn added that Obama has no room to negotiate on the bill.
The Senate will start work on a CR this week.
Democrats are questioning if a $10 million payment broke federal law.
If Saudi Arabia wasn’t involved, it “has nothing to fear from litigation,” the senators said.
Sen. Ron Johnson wants interview notes on the team that set up Clinton's server.
Sen. Chuck Grassley said the Nevada Democrat is using "personal insults."
Senators could force the vote this month.