Today's must-reads: July 15

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After the attack in Nice, France, Donald Trump said he would postpone his vice presidential announcement but posted on Twitter this morning that he had chosen Indiana Gov. Mike Pence. Ohio's open-carry gun law causes complications for security personnel ahead of the Republican National Convention in Cleveland. Next Avenue looks at what older voters may want to hear from speakers during next week's convention. Washington Week is live from Cleveland tonight.

PBS NewsHour Countdown to Cleveland — and Trump’s vice presidential pick Cleveland prepares to kick off the Republican National Convention.