WASHINGTON — Former Republican presidential candidate and ex-Senate leader Bob Dole has been hospitalized for something that goes beyond a mere checkup, the current Senate leader Harry Reid said Tuesday.

Dole, 89, is at Walter Reed Army Medical Hospital outside Washington but "not for a checkup. He is there because he is infirm. He is sick," Reid said on the Senate floor.

There was no word on precisely what medical problem Dole has.

An aide to Dole tweeted that Dole will be discharged Wednesday and is "doing very well," NBC News reported.

Dole was the Republican presidential candidate in 1996, losing to incumbent Bill Clinton.

In 1976 he ran for vice president as fellow Republican Gerald Ford lost to Jimmy Carter.

Dole retired from the Senate in 1996.