Rep. Justin Amash (R-MI) didn't hold back on Twitter about the Senate Democrats who voted in favor of the (failed) gun control amendments in the Senate on Monday. Amash, who is chairman of the House Liberty Caucus, slammed the senators for essentially ignoring due process rights.

Democratic senators now refer to constitutional due process as "the terror gap." — Justin Amash (@justinamash) June 20, 2016

Last week, it was Rs (and Ds) undermining the 4th Amendment. This week, it's Ds (and Rs) undermining the 5th and 2nd Amendments. Disgusting. — Justin Amash (@justinamash) June 20, 2016

He also called out Democratic presidential candidate Sen. Bernie Sanders (I-VT) for trampling on Constitutional rights.

"Potential." You're more honest than most, Bernie. Do you not realize the implications of what you're saying? https://t.co/bY0U9BqlVc — Justin Amash (@justinamash) June 20, 2016

Ds oppose employers' denying jobs bc of criminal conviction (Ban the Box) but support govt's denying fundamental rights w/o charge or trial. — Justin Amash (@justinamash) June 21, 2016

In sum:

Amash is correct. The terror watch list and the no-fly list are not things that should be used to strip American citizens of their constitutional rights. (The ACLU agrees.) The lists are not perfect by any means, and the government does not have to provide a reason to put someone on them. That's a scary concept.