Sen. Ben Cardin (D-MD): If you espouse hate, violence, you're not protected under the 1st Amendment.

Sen. Ben Cardin (D-MD): "If you espouse hate, if you espouse violence, you're not protected under the First Amendment. So, I think we can be more aggressive in the way that we handle that type of use of the internet."

Benjamin Louis Cardin is an American lawyer and politician serving as the senior United States senator from Maryland, a seat he has held since 2007. A member of the Democratic Party, he previously was the U.S. representative for Maryland's 3rd congressional district from 1987 to 2007. Cardin served as a member of the Maryland House of Delegates from 1967 to 1987 and as Speaker of the Maryland House of Delegates from 1979 to 1987, the youngest person to hold the position in history. In his half-century career as an elected official, he has never lost an election.

https://en.wikipedia.org/wiki/Ben_Cardin

First Amendment: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

https://constitution.congress.gov/constitution/amendment-1/