Bloomberg reports:

Biden administration officials are discussing whether the US should subject some of Elon Musk's ventures to national security reviews, including the deal for Twitter Inc. and SpaceX's Starlink satellite network, according to people familiar with the matter.

US officials have grown uncomfortable over Musk's recent threat to stop supplying the Starlink satellite service to Ukraine -- he said it had cost him $80 million so far -- and what they see as his increasingly Russia-friendly stance following a series of tweets that outlined peace proposals favorable to President Vladimir Putin. They are also concerned by his plans to buy Twitter with a group of foreign investors.
The "group of foreign investors" the Biden administration is reportedly worried about oddly includes Prince Alwaleed bin Talal of Saudi Arabia, who has already been a massive Twitter shareholder for years. The White House certainly never had a problem with foreign investors there before.