Sen. Roy Blunt (R-Mo.), a member of the Intelligence Committee and GOP leadership, said that he would support subpoenaing the whistleblower if Burr takes that path.

“I’d be supportive of whatever it takes, including a subpoena,” Blunt told The Hill, adding that he also thought the committee “would probably be willing to do this in any reasonable way that the whistleblower would be willing to come forward.”

https://thehill.com/homenews/senate/483196-senate-braces-for-fight-over-impeachment-whistleblower-testimony