The US and Poland's presidential couples were shaking hands Thursday before Trump's speech in front of a crowd in Warsaw, the Polish capital.
Poland's first lady, Agata Kornhauser-Duda, shook hands with Trump and then all four of them lined up for a photograph.
She then moved with an extended hand toward Melania, but Trump, standing nearer, thought the handshake was for him again and reached out to Kornhauser-Duda.
He flashed a somewhat startled and disappointed look when the Polish president's wife shook Melania's hand, not his.
Quickly sizing up the situation, Kornhauser-Duda gave Trump a second handshake and he gave her a pardoning smile....