Nineteen U.S. states have introduced bills that would curb freedom of expression and the right to protest since Donald Trump¡¯s election as president, an ¡°alarming and undemocratic¡± trend, U.N. human rights investigators said on Thursday.

Concerns for free speech in the United States have risen in part because of the Republican Trump¡¯s antagonistic relations with prominent U.S. media, which he has branded ¡°the enemy of the American people¡± as it has reported on policy missteps and dysfunction in his administration.

The push for stricter laws on expression has come as Trump¡¯s liberal foes have pursued public protests over his policies on issues ranging from immigration to abortion and climate change.