The treatment can help children with seizure disorders.
McCain, Graham and Rubio say executive action would be "divisive."
"This kind of offensive behavior is no way to treat a friend," GOP Rep. Pete Olson said.
Rep. Mario Diaz-Balart (R-Fla.) says it's "ludicrous" for the U.S. to send a representative.
"The news that your agency released violent criminals onto our streets and into our communities raises serious concerns and questions," said Rep. Diane Black (R-Tenn.).
McCarthy has given National Republican Congressional Committee $4 million in total.
Rep. Kyrsten Sinema (D-Ariz.) expressed concern that the VA's language could be read as more than 30 days.
Rep. Paul Broun might have used federal money for a campaign consultant, report alleges.
The Speaker condemned an official for calling the Israeli prime minister "chickens---."
Texan said to allow foreign Ebola patients into the U.S. would be "electrifying."