As President Donald Trump overhauls U.S. policy in Africa ? slashing foreign aid programs and paring back assistance for allied forces in the region ? al-Shabab militants are on the march in Somalia. One of al-Qaida?s best-funded and most lethal global affiliates, al-Shabab has retaken important towns from Somali forces over the past three months. Its fighters previously launched an assault on a U.S. airfield in Kenya and plotted attacks on the U.S. mainland. Under the second Trump administration, it?s unclear whether Washington believes that the battle against the group should still be a priority ? or if the Somali government, long racked by corruption, is capable of leading the fight. ?The...