From left, Rep. Rashida Tlaib, D-Mich., Rep. Ilhan Omar, D-Minn., Rep. Alexandria Ocasio-Cortez, D-N.Y., and Rep. Ayanna Pressley, D-Mass., respond to remarks by President Donald Trump after his call for the four Democratic congresswomen to go back to their "broken" countries, during a news conference at the Capitol in Washington, Monday, July 15, 2019. All are American citizens and three of the four were born in the U.S. (AP Photo/J. Scott Applewhite)

WASHINGTON — Long before President Donald Trump turned up the heat on four Democratic congresswomen of color, saying they should "go back" to their home countries, hateful rhetoric and disinformation about the self-described squad was lurking online.

Racist, inflammatory and inaccurate content has circulated on far right blogs, news sites and social media accounts about Rep. Ilhan Omar of Minnesota and her three freshman colleagues since they ran for public office. With his tweets and harsh comments, Trump has elevated that rhetoric, playing into a conspiratorial feedback loop that reared its head repeatedly during his campaign and presidency.

Trump rose to conservative prominence by falsely claiming former President Barack Obama wasn't born in the country. Since then, he has promoted claims that originated in the darkest corners of the internet while fueling new ones of his own.

some text President Donald Trump speaks with reporters on the South Lawn of the White House before departing, Wednesday, July 17, 2019, in Washington. (AP Photo/Alex Brandon)

His latest targets are Omar and Reps. Alexandria Ocasio-Cortez of New York, Ayanna Pressley of Massachusetts and Rashida Tlaib of Michigan.

In his Sunday tweets, Trump claimed, without identifying the women by name, that the minority legislators "originally came from countries whose governments are a complete and total catastrophe." He suggested they should "go back" to those "totally broken and crime infested places," even though three of the four were born in the U.S. and all are U.S. citizens. He has since questioned the women's allegiance to their country, accusing them of hating America and promoting terrorism while suggesting they should leave America if they're unhappy here.

For some, the Republican president's tweets were shocking. But for others, they were just an average day on Facebook or Twitter, where allegations that Omar was not legitimately elected, is not a U.S. citizen and committed immigration fraud have festered in far right chatrooms, blogs and social media sites since she was elected to the Minnesota House of Representatives in 2016.

"This is the agenda of white nationalists, whether it is happening in chat rooms or it's happening on national TV," Omar said this week. "And now it's reached the White House garden."

Omar was born in Somalia and immigrated to the U.S. as a refugee in 1995 when she was a child. She became a U.S. citizen in 2000 at age 17.

The rumors about her have been spread by dozens of conservative social media figures and bloggers, including Michelle Malkin and Laura Loomer, the latter now banned from Facebook. In February, self-described far right social media influencers Jacob Wohl and Loomer flew to Minneapolis, where they provided live updates on Instagram, Twitter and Facebook of their trip to "investigate" Omar's past and immigration status. Even seemingly everyday citizens have taken to social media to upload their own theories on Omar's background, with one Minnesota woman posting a video months ago on Facebook sharing "proof" Omar is not a U.S. citizen. The video has been watched more than 50,000 times.

Trump also repeated a contested claim, characterizing as "fact" that Omar had married her brother, before acknowledging that he really didn't know.

some text In this July 15, 2019, photo, Rep. Alexandria Ocasio-Cortez, D-N.Y., speaks as, from left, Rep. Rashida Tlaib, D-Mich., Rep. Ilhan Omar, D-Minn., and Rep. Ayanna Pressley, D-Mass., listen during a news conference at the Capitol in Washington. Long before President Donald Trump attacked the four Democratic congresswomen of color, saying they should “go back” to their home countries, they were targets of hateful rhetoric and disinformation online.(AP Photo/J. Scott Applewhite)

"Well, there's a lot of talk about the fact that she was married to her brother," Trump said this week in response to a question posed by a conservative news outlet. "I know nothing about it. I hear she was married to her brother. You're asking me a question about it. I don't know, but I'm sure that somebody will be looking at that."

Omar has described such allegations as "disgusting lies." She has declined to provide access to immigration records, birth certificates or other documents that could verify her family history.

Omar, the biggest target of online vitriol among the four legislators, has made comments that raise eyebrows, including a remark this spring in which she referenced the Sept. 11 attacks by saying that "some people did something." She was also criticized for asking a judge in 2016 to show leniency toward a man accused of trying to join the Islamic State.