Key lawmakers expressing concerns about the Obama administration's plan to send 20 F-16 fighter jets to Egypt, where new President Mohamed Morsi's allegiances are as uncertain as his grip on power. Under a foreign aid deal signed in 2010, when Morsi's U.S.-friendly predecessor Hosni Mubarak was in charge, the U.S. is giving the planes to Egypt's air force, which already has more than 200 of the aircraft. The first four jets are to be delivered beginning Jan. 22, a source at the naval air base in Fort Worth, where the planes have been undergoing testing, told FoxNews.com. But the $213...