Today’s biggest stories:

• Senate Democrats, led by Connecticut senator Chris Murphy, have launched a filibuster to demand universal-background-check gun-control laws and a prohibition on gun purchases by suspected terrorists. Murphy was sworn into office just weeks after the Sandy Hook massacre in Newtown, Connecticut.
• A two-year-old was killed in an alligator attack at a Disney World hotel.
• The first big post-Orlando presidential poll was not good for Donald Trump.
• Trump also made an inflammatory (if not entirely baseless) comment at a North Carolina rally about American soldiers stealing money in Iraq.
• And he was discovered to have not paid any federal income tax in 1984. (Here’s today’s Trump Apocalypse Watch.)