WASHINGTON (Reuters) -U.S. President Joe Biden said on Wednesday he thinks Twitter boss Elon Musk’s relationships with other countries is worthy of being looked at. Biden was asked at a news conference whether he thought Musk was a threat to national security and if his acquisition of Twitter with help from a Saudi Arabian conglomerate should be investigated by the U.S. government. “I think that Elon Musk’s cooperation and/or technical relationships with other countries is worthy of being looked at,” Biden said. “Whether he is doing anything inappropriate, I’m not suggesting that. I’m suggesti…