The Tea Party Express, a California-based political action committee, formally announced its endorsement today of Republican U.S. Senate candidate Milton Wolf. The announcement is being made in a series of public events around the state, including one scheduled for 3 p.m. this afternoon at the Celtic Fox, a restaurant and bar in downtown Topeka.

Wolf is challenging incumbent GOP Sen. Pat Roberts in the Aug. 5 primary.

The Tea Party Express was established in 2009, mainly to promote opposition to President Obama’s health reform law, commonly called Obamacare. According to an early article posted by Talking Points Memo, it received initial financial backing from Our Country Deserves Better PAC and Americans for Prosperity, a group largely funded by David and Charles Koch.

“Dr. Milton Wolf has intimate knowledge of America’s healthcare system and is the perfect person to tackle President Obama’s failed healthcare policy,” Tea Party Express Chairwoman Amy Kremer said in a statement. “He even has proposed his own alternative to the Obamacare train wreck, Patient Care. It’s that kind of conservative leadership that has been largely absent for far too long in D.C. I am confident Dr. Wolf will join the ranks of Senators Ted Cruz, Mike Lee, and Rand Paul when he is elected.”