Donald Trump Jr. vigorously defended his father on Thursday in a response to CNN reporter Jim Acosta’s attempts to pin some culpability for this week’s mail bomb scare on the White House. FBI agents are still examining mail bombs sent to former President Barack Obama, former Secretary of State Hillary Clinton, CNN and a host of other high-profile Democratic individuals this week, but the blame game regarding the motives of a still-unidentified suspect are in full swing. “Trump talked about the bombs sent to former public officials at his rally in Wisconsin,” Mr. Acosta tweeted Wednesday evening. “But once again...