Nearly as many migrants have died in detention so far this year than over the four years of the Biden administration.

Professor Michael Mann and Dr. Peter Hotez are leading experts on climate change and vaccines, respectively, and in recent years, have both been targeted by those who seek to discredit their expertise. That experience led the two to come together to write the new book "Science Under Siege." The campaign against them and other scientists "was organized, it was deliberate, it was politically motivated, and it was financially motivated," Hotez tells Ali Velshi. "The overriding crisis is the rise of misinformation and disinformation," Mann adds.

The new rule, established by the GOP on party lines, will enable it to confirm Trump nominees in groups, rather than individually. It's the latest move to erode minority powers.

The covert official was included in a list of names shared by Gabbard online.