Federal agents arrested President Trump’s ally and former adviser Roger Stone early Friday morning, with prosecutors from special counsel Robert Mueller’s team charging the longtime Republican operative with obstruction, witness tampering and lying to Congress about his communications with WikiLeaks. An indictment unsealed Friday reveals that a senior Trump campaign official “was directed” to contact Stone ahead of the 2016 election to see what other leaks about Hillary Clinton and the Democratic National Committee were coming from WikiLeaks. That revelation suggests the Trump campaign knew about thousands of stolen Democratic emails before they were made public by WikiLeaks.