Trump names 4th national security advisor amid Iran tensions; Feds: airline mechanic accuse of sabotage had ISIS video on phone; Trump to visit border wall as another top DHS official fired; Chilling back-to-school ads call for tighter gun restriction

Pompeo arrives in Saudi Arabia, calls oil attacks "act of war"; Saudi show alleged Iranian weapons used in oil field attacks; Pres Trump announces plans for new sanctions on Iran; Trump: plenty of time to do some "dastardly things" to Iran; Dem Sen Murphy: no secret defense treaty with Saudi Araba; Feds say airline mechanic accused of sabotage told co-workers his brother was a member of ISIS; Trump takes aim at California while he's visiting state; Trump expected to raise as much as $15 mill in west coast visit; Trump blames Beto O'Rourke for stalled gun reform after he says "we're going to take your AR-15"; AG Barr on hill discussing expanding background checks, WH says Trump has not signed off on proposal; Trump admin refuses to hand over whistleblower complaint to house intel committee; Teen girl tells congress to "listen to the scientists", demands lawmakers act now on climate crisis

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