“A day after John R. Bolton went to work as national security adviser, he began shaking up the Trump administration’s national security ranks, ousting President Trump’s chief adviser on homeland security, Thomas P. Bossert.
Mr. Bossert’s sudden departure on Tuesday was the latest in an exodus of senior officials, and it leaves the White House short-handed in counterterrorism and cybersecurity operations as the president moves closer to a military strike on Syria.”