Hillary Clinton captured the mostly symbolic Democratic primary Tuesday in the US capital, the final vote of the 2016 presidential primaries, as the race shifts to her showdown with Republican rival Donald Trump.

Hillary Clinton captured the mostly symbolic Democratic primary Tuesday in the US capital, the final vote of the 2016 presidential primaries, as the race shifts to her showdown with Republican rival Donald Trump.

Clinton won nearly 79 percent of the vote against 21 percent for Bernie Sanders, with nearly all votes counted, according to US networks.

The attention of the candidates -- and the nation -- however has shifted to the aftermath of the Orlando shooting, the deadliest terror attack on US soil since September 11, 2001.

Clinton and Trump traded verbal blows and presented dramatically different approaches for fighting terrorism following the massacre at the Florida gay nightclub.

Trump, the presumptive Republican nominee, on Monday said that if elected he would "suspend" immigration from areas with a "proven history of terrorism."

He also suggested that US Muslims were complicit in domestic attacks because they failed to "turn in the people who they know are bad."

In contrast, former secretary of state Clinton called on Americans to "stand together" to defeat terrorism.

But after Trump suggested in a TV interview that Obama sympathized with terrorists, Clinton on Tuesday slammed her rival's approach "dangerous" and "un-American."

"Even in a time of divided politics, this is way beyond anything that should be said by someone running for president of the United States," she told supporters in Pittsburgh.

"What Donald Trump is saying is shameful ... more evidence that he is temperamentally unfit and totally unqualified to be commander in chief," she said.