Despite warmth, Merkel and Trump still differ on trade and NATO

By Jeff Mason and Andreas RinkeWASHINGTON (Reuters) - German Chancellor Angela Merkel and U.S. President Donald Trump aired differences over trade and NATO on Friday at a White House meeting where they tried to put on a show of warmth and friendship despite tensions between the two allies.With Trump poised to impose tariffs on steel and aluminum soon that will impact European exports, Merkel said the decision is now in Trump's hands on whether to grant exemptions to European Union nations.The de