They held a rally in Newport Beach calling for his administration to do three things.
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They're demanding an end to genocide against Christian Armenians, sanctions against Turkey and Azerbaijan and an end to U.S. funding of so-called war crimes.
Armenia and Azerbaijan are blaming each other for the breakdown of a new cease-fire agreement over a disputed region between the two countries, the region of Nagorno-Karabakh.
The Azerbaijan Ministry of Defense claims Armenia fired mortars and artillery at the southwestern part of the country.
Meanwhile, the Armenian Ministry of Defense accuses Azerbaijan of firing rockets.
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The cease-fire was supposed to start Sunday.
Tensions between the two countries have flared up over the past few weeks. Hundreds have died in the fighting, including civilians.
The disputed region is internationally recognized as being part of Azerbaijan, but is governed by a majority group of ethnic Armenians.