Russia remains a driving force, but researchers also discovered numerous copycats, particularly on the far right. It’s also nearly impossible to quantify the scale and resonance of the misinformation. Researchers say millions of people see the material.

Big picture: Russia remains undeterred in its campaign to widen political divisions and weaken Western institutions. It remains far easier to spread false information than to stop it. And even though the behavior is unlikely to swing elections, the goal is to muddle the conversation, make people question what is true and erode trust.

Other Russia news: A Russian television network is telling viewers that their 5G cellphones pose dire health threats, like brain cancer, autism and Alzheimer’s — claims that lack scientific support.

Orban will meet Trump

Hungary’s far-right prime minister, Viktor Orban, is set to meet President Trump today in the Oval Office. It will be the first time Mr. Orban has had a private audience with a president at the White House since 1998.