Story highlights "Many of the thugs that attacked the peaceful Trump supporters in San Jose were illegals," Trump claimed

Clinton said Trump has "lowered the bar" for civility and should condemn the violent outbursts

Washington (CNN) Donald Trump is blaming the violent clashes between protesters and his supporters outside his San Jose campaign rally earlier this week on "thugs" and "illegals."

"Many of the thugs that attacked the peaceful Trump supporters in San Jose were illegals. They burned the American flag and laughed at police," Trump tweeted Saturday morning.

Many of the thugs that attacked the peaceful Trump supporters in San Jose were illegals. They burned the American flag and laughed at police — Donald J. Trump (@realDonaldTrump) June 4, 2016

Several of the demonstrators could be seen waving Mexican flags, but Trump offered no evidence that undocumented immigrants were involved in the unrest, which was at times marked by physical altercations between his supporters and opponents.

Trump on Saturday also blamed San Jose Mayor Sam Liccardo for a lack of security during the protests.

"The Mayor of San Jose did a terrible job of ordering the protection of innocent people. The thugs were lucky supporters remained peaceful!" Trump tweeted.

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