Sen. John McCain, R-Ariz., said Wednesday President Trump's tweets on banning transgender people from serving in the military were "unclear" and that there should be no change of policy until Congress reviews the results of an ongoing study by the Defense Department.

"The president's tweet this morning regarding transgender Americans in the military is yet another example of why major policy announcements should not be made via Twitter," said McCain, the Armed Services Committee chairman. "The statement was unclear."

The department allowed those troops to serve openly beginning last year and Defense Secretary Jim Mattis delayed a deadline this month until January as the military studies what would be required to begin transgender recruiting.

McCain said no new policy decision is appropriate until the ongoing study is complete and reviewed by Mattis, the military, and Congress.

"There is no reason to force service members who are able to fight, train, and deploy to leave the military — regardless of their gender identity," McCain said in a released statement. "We should all be guided by the principle that any American who wants to serve our country and is able to meet the standards should have the opportunity to do so — and should be treated as the patriots they are."

He isn't the only Republican senator seemingly opposed to Trump's ban. When asked on Twitter whether he stood with transgender Utah residents, Sen. Orrin Hatch, R-Utah, simply replied "Yes."

He later said in a statement: "I don't think we should be discriminating against anyone. Transgender people are people, and deserve the best we can do for them. I look forward to getting much more information and clarity from our military leaders about the policy the President tweeted today."