WASHINGTON - Khizr Khan, the father of fallen Muslim-American Army Capt. Humayun Khan, is actively campaigning for Hillary Clinton, the Democratic Presidential candidate, as the Election Day draws closer.

Khan, a Pakistan-born lawyer, gained national attention when he spoke alongside his wife, Ghazala, during the Democratic National Convention (DNC) in July, lashing out at Donald Trump, the Republican Presidential nominee, for his proposal to ban Muslims from entering the United States.

Since the DNC, Khan has become a key ally for the Clinton campaign, appearing in an ad for the nominee and repeatedly speaking out against Trump.

A Pakistani organisation also released his video message in which Khizr Khan, speaking in Urdu, urged Muslim-Americans to vote for Clinton on Tuesday (Nov 8),  arguing on the basis of the Constitution that Trump’s exclusion and disdain of the Muslim community was ultimately un-American.

On Sunday, Khan conveyed his message to Muslim-Americans through a robo-call to 500,000 registered voters, organised by the Council on American-Islamic Relations (CAIR), a Muslim advocacy group, according to a Press release.

He has been speaking at community events while Muslim-Americans comprise a mere 1 per cent of the country’s population, their votes may play an outsized role in this election.

The Muslim population is concentrated in several key battleground States including Florida, Virginia, Michigan, and Ohio, where the race is tight and will likely be decided by small margins.

Muslims outsized influence is not without precedent. They leaned Republican before the election of George W. Bush to the White House, in part due to conservative social values; 72 per cent voted for Bush in 2000. The Muslim swing vote may have been the deciding factor in Florida—and ultimately the election—where margins were razor thin and Bush carried the State by a few hundred votes.

In the years since, the Muslim vote has drifted leftward as wars have intensified in the Middle East.

Trump’s declaration that “Islam hates us” and his proposal to ban Muslims from the US clinched the deal between Muslims and Democrats.

Khan’s speech at the DNC and subsequent calls for action among Muslims appear to be working: Muslim activist and commentator Wajahat Ali dubbed American Muslims “Khizr Khan voters” in a recent column, arguing that Trump’s Islamophobia, highlighted by Khan, has boosted Muslim political engagement.

In June, CAIR reported that voter registration among American Muslims was up 30 per cent from 2012.

The US Council on Muslim Organisations, another advocacy group, has spent the past year registering thousands of Muslim voters across the country.

On Nov. 2 it announced that a record-breaking 1 million Muslims are currently registered to vote Tuesday. A CAIR survey found that 86 per cent of Muslims intend to vote for Clinton.

“Trump’s bigotry was a blessing in disguise,” Zahir Bukhari, a member of the Islamic Circle of North America who has been campaigning for Muslims to get out the vote, told the Wall Street Journal.

CAIR executive director Nihad Awad echoed the sentiment: “I usually don’t thank the candidates but I’d like to thank Trump for energizing the Muslim community."