Khizr Khan, the father of a slain Muslim U.S. soldier, who condemned Republican nominee Donald Trump at the Democratic National Convention, has ties to Democrat nominee Hillary Clinton's secret email server she used as secretary of state.

As WND recently reported, Khan previously worked for nine years at the Washington-based global law firm Hogan & Hartson, which is now called Hogan Lovells Llp. Today, he has a law firm in New York called KM Kahn Law Office. But on Tuesday, he suddenly deleted his law firm's website from the Internet.

According to a screenshot captured by the Internet archiving website Wayback Machine, Khan managed Hogan & Hartson's "Litigation Technology Services group" for the firm's domestic and international branches.

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According to the page, Khan "was responsible for numerous large electronic discovery projects in complex litigation, mergers and acquisitions."

"Oddly enough, Hogan & Hartson – again, the firm for which Khan oversaw the Tech branch for nearly a decade – was the law firm who handled the patent for 'SPAMTRAQ,' the spam-filtering program used on Clinton's server," according to the Daily Caller.

Breitbart's Patrick Howley reported that SPAMTRAQ was a creation of MX Logic, a Denver-based company that has a checkered history of leaving servers open to security breaches.

Bill and Hillary Clinton's personal tax attorney, Howard Topez, worked for Hogan & Hartson while Khan was there. Topaz is still employed at the firm.

There's another curious twist to Khan's work history at Hogan Lovells Llp, as the firm was contracted by the Saudis to work for the Royal Embassy of Saudi Arabia until 2016, according to the Washington Free Beacon.

The Free Beacon noted, "Robert Kyle, a lobbyist from the firm, has bundled $50,850 for Clinton's campaign," and it added: The Saudi government has "supplied the Clinton Foundation with millions. The Kingdom of Saudi Arabia has given between $10 and $25 million to the foundation while Friends of Saudi Arabia has contributed between $1 and $5 million."

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That connection led FrontPage Magazine's Robert Spencer to ask: "Is Saudi Arabia trying to manipulate the U.S. presidential election?"

At his own firm, Kahn now helps obtain EB5 immigration visas and offers other "Related Immigration Services."

The EB5 visas allow wealthy foreigners – such as migrants from China, South Korea, Mexico and the Middle East – to get green cards if they invest in American jobs.

"In effect, rich people can buy American citizenship, and that's made it controversial in an era of wariness about immigration," wrote Atlantic reporter Alana Semuels. "Most of them are doing it because they want the green card and it's the fastest or best way to get a green card."

The program has been widely criticized as being "especially susceptible to corruption and of questionable worth."

As WND reported, Khan, who was accompanied on stage by his wife Ghazala Khan, appeared on stage at the DNC and criticized Trump for proposing to temporarily halt migration from countries that have exported Muslim terrorists and to build a wall on America's southern border.

Khan accused Trump of proposing to violate the U.S. Constitution, apparently presuming the Constitution forbids vetting foreigners who want to enter the U.S. from countries known to harbor terrorists.

Khan later said Trump is a “black soul,” and Trump responded with a tweet insisting Khan has "no right” to criticize him in a public forum.

Kahn's son, Capt. Humayun S. M. Khan, was killed in Iraq in 2004 after he confronted a bomb-packed taxi that drove into a compound while he was inspecting soldiers on guard duty. He told the soldiers to drop to the ground then went to stop the car, which exploded, killing him and two Iraqi soldiers. He was buried in Arlington with full military honors and posthumously awarded a Bronze Star and Purple Heart.

On Saturday, Trump issued a statement calling Khan "a hero" and urging vigilance in defeating radical Islamic terrorism.

"Captain Humayun Khan was a hero to our country and we should honor all who have made the ultimate sacrifice to keep our country safe," Trump said. "The real problems here are the radical Islamic terrorists who killed him, and the efforts of these radicals to enter our country to do us further harm."