A large part of the National Firearms Act is now unconstitutional, a federal judge ruled Wednesday, in a decision that could erase registration requirements for sales or transfer of silencers and short-barreled long guns.

The Trump administration has awarded a $150 million contract to give legal representation to migrant children traveling alone to the U.S. to a small Texas law firm with ties to the administration but little experience in immigration law, prompting legal aid groups who've long represented those children to warn that the move could make them vulnerable to deportation.