His nickname around the Texas Capitol is "mucus." It’s a play on Michael Quinn Sullivan’s initials — MQS — but the moniker underscores how much of an irritant the conservative activist has become to politicians who dare buck his Tea Party orthodoxy. It also says something about his staying power.

A threat from the federal government to shut down Texas airports or cancel flights may have killed legislation by Tea Party conservatives in the Capitol to prohibit federal agents from conducting "invasive searches."

The state’s contentious sanctuary cities bill failed to move out of the Senate late Tuesday — a ...

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