Tim Donner, the wealthy businessman who once ran against former governor and senator George Allen for the GOP primary for U.S. Senate race, has endorsed him in a letter to supporters Tuesday.

Tim Donner (Ricky Carioti/The Washington Post)

Donner dropped out of the race, leaving Allen to face former Virginia Tea Party Patriots head Jamie Radtke, Del. Robert G. Marshall (Prince William) and Bishop E.W. Jackson.

“Tim will be a most welcomed key, respected leader carrying our positive message of envisioning a better future for families and job creating small business owners,’’ Allen said in a statement. “Tim and I share the same serious concerns that America’s freedoms and opportunities are at risk because of an over-spending, over-regulating federal government. We both want to see the repeal of Obamacare, while advancing personal health care options rather than government-rationed care.”

The winner of the June 12 contest will face former governor Timothy M. Kaine (D) in November to determine who succeeds retiring Sen. James Webb (D).