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Discrimination against LGBT people must be tackled at home and abroad, President Obama has said after meeting relatives of Orlando attack victims.
A gunman killed 49 people on Sunday morning at a gay nightclub in the city.
Mr Obama challenged the Republican-controlled Congress to pass gun control legislation.
But Republican Senator John McCain said the president was "directly responsible" because he had failed to tackle the Islamic State group.
Gunman Omar Mateen claimed allegiance to the militant group as he carried out the massacre.
Senator McCain said: "When he pulled everybody out of Iraq, al-Qaeda went to Syria, became Isis [Islamic State], and Isis is what it is today thanks to Barack Obama's failures, utter failures, by pulling everybody out of Iraq."
He later clarified that he did not mean the president was personally responsible.
On Thursday, hundreds of people gathered outside the Amway Center in Orlando as the president and Vice-President Joe Biden consoled relatives inside.
"I held and hugged grieving relatives and they asked: Why does it keep happening?" Mr Obama said, adding: "They don't care about the politics."
(BBC)
