Randy Travis -- Get Well Phone Call From CHUCK NORRIS!!!

Randy Travis' friends are rallying for the country singer to get better ... and TMZ has learned several celebrities have called RT to send their well wishes ... including Chuck Norris!!!

Randy's publicist tells us several stars have reached out since Randy was admitted to the hospital with heart issues this weekend ... including Josh Turner, The Oak Ridge Boys, Joe Nichols, Lyle Lovett, Kenny Rogers, Ray Price, Lee Greenwood and Chuck Norris.

Unfortunately, Randy suffered a medical setback last night when he had a stroke that required emergency surgery. We're told Randy is currently recovering, but he's still listed in critical condition.

4:20 PM PT -- We're told Randy got a visit from George Jones' widow Nancy Jones -- who brought recordings from George's catalog to play for the ailing country singer.

We're told Nancy was very passionate about being there for Randy because RT had gone out of his way to support her family when George was sick earlier this year.

Nancy issued a statement to TMZ saying, "I love him and I know that George is looking over him during this time."