Juan Pablo Montoya believes Gene Haas is "mad" to try and run a Formula One team from a base in the United States.
NASCAR co-owner Haas was given a FIA license to join the sport in 2015, but Montoya believes approach is completely wrong.
"If he wants to build [the team] here in the States I think it's completely mad," the seven-time Grand Prix winner told Autosport at last weekend's Long Beach IndyCar event.
"You can't even call it mad because it makes no sense.
"You are not going to get people from England to move to Charlotte."
The Colombian added that Formula One should be careful not host to discard its European roots in favour of expanding to other areas of the world.
"I think Formula One has to be careful not to discard Europe too much," he added.
"That is where the original fans are, where the car fans are. You don't want to keep driving away from Europe.
"I know other places will give them more money to go but if you take the British GP, or the Spanish GP away, imagine that.
"There are a lot of big races and you don't want to screw that."
Haas, though, has responded to widespread criticism he has received for his move into Formula One.
"There is obviously skepticism in anything that anybody's trying to do that hasn't been done before," Haas said during a press conference earlier this week.
"The only way I can allay that is to go out there and do it. I think we have the flexibility.
"When things don't go right, we go in a different direction, and we do whatever it takes to get things done.
"I can't tell you about the other people that fail. I don't know why they fail.
"Maybe where they failed, I can figure out how not to. But I firmly believe that we have the right tools to go forward on this and be successful at it.
"I've been pretty successful at taking on projects that other people say you can't do."