More than 160 people are still unaccounted for after deadly flash flooding in Texas and there are now new questions about warning systems in the area. Then, Trump says there will be ‘no extensions' on his new August 1st tariff deadline. Plus, the President announces that the U.S. will send more weapons to Ukraine -- reversing a recent decision to pause military aid. Jeff Mason, Leigh Ann Caldwell, Jon Allen, Brooke Masters, Ron Insana, Eleanor Klibanoff, and Reed Galen join The 11th Hour this Tuesday.

Trump threatens 35 percent tariff on Canada, as the administration fails to announce any new trade deals. Then, Trump approves the delivery of more weapons to Ukraine starting tomorrow, as Russia launches a new attack on Kyiv today. Plus, young Democratic officials launch an initiative to reshape the party's image and recruit fresh faces. Peter Baker, Daniella Diaz, Nayyera Haq, John Harwood, Rohit Chopra, Mallory McMorrow, John Della Volpe, and Aaron Reichlin-Melnick join The 11th Hour this Thursday.