Mitt Romney thanked Sen. Orrin Hatch for his service in the U.S. Senate but avoided commenting on rumors of a possible run for Senate in 2018.

“I join the people of Utah in thanking my friend, Senator Orrin Hatch for his more than forty years of service to our great state and nation,” Romney wrote on Facebook Tuesday after Hatch announced his retirement following the end of his term.

He continued: “As Chairman of the Senate Finance and Judiciary Committees and as the longest-serving Republican Senator in U.S. history, Senator Hatch has represented the interests of Utah with distinction and honor. Ann and I wish Senator Orrin Hatch and his loving wife Elaine all the best in their future endeavors.”

One thing noticeably missing from Romney’s statement was a clear answer on whether or not he will run to fill Hatch’s seat, something that has caused growing speculation over the past few months.

Romney, who now resides in Utah, served as governor of Massachusetts from 2003-2007 and ran as the Republican presidential candidate in 2012 against former President Obama.