Exclusive: Hillary Clinton to launch presidential campaign on Sunday en route to Iowa - source  —  Hillary Clinton is planning to officially launch her US presidential campaign on Sunday while en route to Iowa, a source familiar with the campaign has confirmed to the Guardian.

Authorities release dash cam footage from Michael Slager's patrol car before fatal shooting  —  The State Law Enforcement Division has released a copy of the dash cam footage from North Charleston police officer Michael Slager's patrol car in the moments before he fatally wounded Walter Scott.

Will Chris Christie really run?  —  New Jersey Gov. Chris Christie has seen his presidential stock fall to the point where questions are being raised on whether he'll really enter the race.  —  It's a stunning turnaround for the governor, who not that long ago was seen as the Republican to beat.

Lindsey Graham's strategy: Take down Rand Paul  —  Possible GOP presidential contender finds a foil — and a focus — in attacking rival from Kentucky.  —  Getty  —  South Carolina Sen. Lindsey Graham may still be weighing whether to run for president, but he already has a strategy …

Jeb Bush Leans on His Gun-Rights Bona Fides  —  Potential presidential hopeful looks to shore up conservative support at NRA conference  —  The day after Jeb Bush signed landmark “stand your ground” legislation, one Florida resident emailed the then-governor to thank him “for allowing us to defend ourselves.”

Ayatollah Khamenei Accuses WH of ‘Lying,’ Being ‘Deceptive,’ and Having ‘Devilish’ Intentions  —  President Obama has long known that the real decision maker in Iran is Ayatollah Khamenei, the so-called supreme leader.  While other Iranian officials have negotiated with Western powers …

Daily Caller's Tucker Carlson calls misogynistic e-mail flap an ‘accident’  —  In an appearance on C-SPAN, Tucker Carlson, the Daily Caller's top editor, was asked about the recent flap over a misognyistic e-mail that was sent to Amy Spitalnick, a spokeswoman for New York Mayor Bill de Blasio.

Will 2016 really be a foreign policy election?  —  There's an emerging conventional wisdom that the 2016 presidential race, once predicted to be mostly about economic issues, will instead be dominated by foreign policy.  —  “This is going to be a foreign policy election,” National Journal's Ron Fournier said recently.

The Iran deal: Anatomy of a disaster  —  “Negotiations . . . to prevent an Iranian capability to develop a nuclear arsenal are ending with an agreement that concedes this very capability . . . ”  —  Charles Krauthammer writes a weekly political column that runs on Fridays.