The Trump administration is likely to expand a ban on laptops on commercial aircraft to include some European countries, but is reviewing how to ensure lithium batteries stored in luggage holds do not explode in midair, officials briefed on the matter said on Wednesday.

Any expansion of the ban could impact U.S. carriers such as United Airlines (UAL.N), Delta Air Lines Inc (DAL.N) and American Airlines Group (AAL.O). Six U.S. and European officials said they expect the U.S. Department of Homeland Security (DHS) to make an announcement but declined to say when.

DHS officials plan to meet with airline industry officials on Thursday to discuss security issues, two people briefed on the matter said. Also on Thursday, Homeland Security Secretary John Kelly will give a classified briefing to senators about domestic threats and airline issues are expected to be discussed, a congressional aide briefed on the matter said.