WASHINGTON (Reuters) - Treasury Secretary Steven Mnuchin said on Friday he expects 2020 U.S. GDP growth to be less than 3%, partly due to problems at Boeing Co (NYSE: BA), which halted production of its 737 MAX planes over safety issues.

"I think our projections have been reduced because of Boeing and in other impacts, so it will be lower. I think we would have hit 3% but again, Boeing has had a big impact on our exports being the largest exporter," Mnuchin said in an interview on Fox Business Network.

(Reporting by Eric Beech and Mohammad Zargham; editing by Grant McCool)