They targeted Sean Hannity and Laura Ingraham. Now they are turning to Tucker Carlson.

Activists from Media Matters for America, Sleeping Giants and other groups are pressuring advertisers to drop “Tucker Carlson Tonight” on Fox News after the host caused a stir last week when he described mass immigration as making the country “poorer and dirtier and more divided.”

Fox News is standing behind Carlson and has blasted the activist groups for what it sees as their attempts to curtail freedom of speech.

In what has become a familiar pattern, the on-air comments have caused a ruckus on social media, prompting activists to contact the show’s advertisers.

Pacific Life Insurance was the first to pull its commercials, saying it will pause its ads and re-evaluate its relationship with the show.

It was among at least eight advertisers who have said they won’t advertise on “Tucker Carlson Tonight” or have no plans to do so.

The companies include IHOP, SmileDirectClub and Nautilus, the owner of Bowflex.

Several advertisers are sticking with Carlson, including Farmers Insurance, Mitsubishi, John Deere, Bayer and Sanofi.

Despite the advertiser flight, Fox News is defending Carlson, who is a ratings champion for the network.

“It is a shame that left-wing advocacy groups, under the guise of being supposed ‘media watchdogs,’ weaponize social media against companies in an effort to stifle free speech,” said a representative of the network. “We continue to stand by and work with our advertisers through these unfortunate and unnecessary distractions.”

The Fox News representative said advertisers who had dropped Carlson were redirecting their commercials to other shows on the network, and that no revenue had been lost for the network.

Carlson struck a defiant tone on Monday’s prime-time show, indirectly referencing the ad boycott.

“The left would very much like you to stop talking and thinking about bad decisions they’ve made over the years that they happen to be profiting from. Shut up, they’re screaming, including, to this show,” he said.

Carlson devoted a segment of Monday’s show to documenting the amount of trash generated by the recent migrant caravan that is currently stopped in Tijuana.

He commented on the impact of illegal immigration on the environment along the U.S.-Mexico border.

Advertisers have boycotted “Hannity” and “The Ingraham Angle,” which like Carlson’s show rank as Fox News’ highest-rated prime-time programs.

Laura Ingraham landed in hot water in May when she criticized David Hogg, a student at Stoneman Douglas High School in Parkland, Florida, the site of a deadly shooting in February.

Sean Hannity went through his own advertiser boycott last year following his coverage of the death of Seth Rich.

“Tucker Carlson Tonight” ranks No. 1 in its time slot, with over 2.8 million in total viewers, according to Nielsen Media Research.