"It's important for local leaders to express solidarity and make clear we stand against bigotry, against racism and with our Muslim neighbors in the state and beyond." The group organizing the rallies, ACT for America, has chapters around the country and says it is focused on fighting terrorism and promoting national security.
Muslims call the claims ludicrous and say Islamic law plays a role similar to Jewish law, as a guide to religious life rooted in the Quran.
Two far-right groups, the Oath Keepers and the Three Percenters, are to provide security at some of the rallies, apparently the first simultaneous anti-Shariah rallies in the U.S.
The Seattle rally originally was planned for Portland, but an organizer canceled it after Portland Mayor Ted Wheeler called on the federal government to deny a permit, with Wheeler saying the rally would exacerbate tensions after the stabbings.
Mosque member Drew Williams said the man claimed to have killed Muslims while serving in the military in Iraq and told witnesses, "I have no problem killing you." The man was charged with intimidation, menacing and harassment.