Gosar's support of conspiracy theories,[4][5] his extreme opposition to abortion and contraception,[6][7] his connections to Holocaust deniers, and his ties to far-right militant groups such as the Proud Boys and Oath Keepers, have sparked controversy.

[42] Gosar defeated former state senator Ron Gould and businessman Rick Murphy in the Republican primary, all but assuring him a second term in Congress.

[46] In September 2018, six of Gosar's nine siblings spoke out against their brother and endorsed his Democratic opponent, David Brill, in a series of television campaign ads that drew national and international coverage.

Paul Gosar responded to the ads on Twitter, describing his siblings as "disgruntled Hillary supporters" who "put political ideology before family".

[52][53] On January 6, 2020, with the caption "The world is a better place without these guys in power", Gosar tweeted a doctored photograph showing Obama meeting Iranian President Hassan Rouhani.

[59][60][61] On February 26, 2021, Gosar delivered the keynote speech at the America First Political Action Conference hosted by white nationalist and antisemite Nick Fuentes, who had previously supported the 2021 United States Capitol attack, defended racial segregation, and denied aspects of the Holocaust.

[61][60] Gosar was joined at the event by former Representative Steve King of Iowa, who was taken off his congressional committee seats after defending white nationalism in 2019.

[79] On May 25, 2022, the day of the Robb Elementary School shooting, Gosar spread racist and transphobic disinformation about the attack, tweeting that the perpetrator was "a transsexual leftist illegal alien named Salvatore Ramos.

"[96] The Arizona Republican Party produced a video, featuring Gosar and Representative Andy Biggs, falsely claiming that there was widespread voter fraud in the election.

[100] Gosar repeatedly spoke at Stop the Steal events, claiming without basis that then-President-elect Joe Biden was an "illegitimate usurper" and that Trump was the victim of an attempted coup.

Gosar was the first member of Congress to advance the false conspiracy theory that antifa was to blame for the violence, echoed by Brooks and Representative Matt Gaetz.

[112] In June 2021, Gosar was one of 21 House Republicans to vote against a resolution to give the Congressional Gold Medal to police officers who defended the U.S. Capitol on January 6.

[124] Gosar said that Francis "adopted all of the socialist talking points, wrapped false science and ideology into 'climate justice' and is being presented to guilt people into leftist policies.

[131] He was criticized for touting funding for Kingman Airport in the Infrastructure Investment and Jobs Act while neglecting to mention that he voted against the final bill.

"[135][136][137] In September 2015, Gosar submitted articles of impeachment against EPA administrator Gina McCarthy, asserting that she had committed "high crimes and misdemeanors" and "lied to the American people in order to force misguided and overreaching regulations, which have no scientific basis, down our throats.

"[140] In 2019, Gosar co-signed a letter from Representative Ro Khanna and Senator Rand Paul to Trump asserting that it is "long past time to rein in the use of force that goes beyond congressional authorization" and that they hoped this would "serve as a model for ending hostilities in the future—in particular, as you and your administration seek a political solution to our involvement in Afghanistan.

[147] In September 2021, Gosar was among 75 House Republicans to vote against the National Defense Authorization Act of 2022, which contains a provision that would require women to be drafted.

[176] In April 2014, Gosar joined a group of five conservative Arizona state legislators at the Bundy Standoff in Bunkerville, Nevada, where grazing fee resistors and their supporters took up arms against Federal Bureau of Land Management and law enforcement officials.

He was responding to concerns from members of the Fort Apache Indian Reservation in eastern Arizona when he made the comment at the round-table talk in Flagstaff.

The proposal, which was attached as a rider to the 2015 National Defense Authorization Act, would give land sacred to the Apache in Arizona to Resolution Copper Mine, a joint venture owned by Rio Tinto and BHP.

[178] Troy Eid, a Republican and former U.S. Attorney in Colorado, responded to Gosar's comments, "In the heated context of what this represents, it's especially inappropriate to be resorting to what amounts to race baiting."

[179] In an October 2017 interview with Vice News, Gosar suggested that the white nationalist Unite the Right rally had been "created by the left", an idea previously expressed by Alex Jones of InfoWars, Representative Dana Rohrabacher, Dinesh D'Souza, and other right-wing figures.

[180] Gosar also suggested that Jason Kessler, the organizer of the Charlottesville rally, might have been backed by George Soros, who he said "turned in his own people to the Nazis".

[183] In July 2018, Gosar spoke at a rally in London in support of former English Defence League leader and anti-Islam activist Tommy Robinson, emphasizing the importance of the right to free speech.

[186] In February 2021, Gosar spoke with King at the second annual America First Political Action Conference, hosted by white nationalist Nick Fuentes.

[187][62] In January 2021, The New York Times detailed Gosar's comments on and ties to the Proud Boys and the Oath Keepers, some of whose members participated in the 2021 storming of the United States Capitol.

Searle reportedly is a "dedicated acolyte of Nick Fuentes, with the Hitler-loving white supremacist leader going as far as to call him a loyal friend and one of the ‘strongest soldiers of the movement.

'"[190] Searle reportedly runs the white supremacist "ChickenRight" accounts on Twitter and Gab, which has posted anti-semitic conspiracy theories about “HOOK-NOSED BANKERS.”[190]

In February 2018, Gosar posted on his Facebook page that the Nunes memo—in which Republican Congressman Devin Nunes accused the FBI and U.S. Justice Department of illegally obtaining a Foreign Intelligence Surveillance Act (FISA) warrant to spy on Trump adviser Carter Page—showed "clear and convincing evidence" that certain members of those agencies committed treason.

In what Gosar called "my full statement on the declassified memo", he said he would be "leading [sic] a letter to the Attorney General seeking criminal prosecution against these traitors to our nation.