Democratic presidential candidate Kamala Harris and Republican rival Donald Trump went head-to-head in Philadelphia on Tuesday at a high-stakes debate hosted by ABC News. Reuters examined 12 claims made by Harris and Trump. STATEMENTS BY HARRIS CLAIM Harris said economists project that Trump's tariff proposals would cost middle-class families about $4,000 more a year (timestamp: 09:05 p.m. ET). WHAT WE KNOW Trump has pledged, opens new tab tariffs of up to 20% on all...