"This kind of thing cannot go unresponded to diplomatically", McCain, the head of the Senate Armed Services Committee, told MSNBC in an interview on Thursday, adding that legal action could also be pursued.
Speaking in Istanbul two days after meeting President Donald Trump in Washington, Erdogan criticized the USA decision to ally with "terror organizations" for the long-awaited operation to capture Raqqa, the de facto capital of the Islamic State group.
Video has emerged of Turkish President Recep Tayyip Erdogan in an official vehicle apparently watching as a goon squad of men in suits charged from near where his auto was parked in Washington and attacked peaceful protesters across the street.
Lucy Usoyan, a Yazidi Kurd demonstrator, told ABC: "All of the sudden they just ran towards us". Kheirabadi said he is a Kurd who passed through Turkey as a refugee and is now a US citizen.More news: Kane scores 4 as EPL runner-up Tottenham routs Leicester 6-1
Metropolitan Police Chief Peter Newsham called Tuesday's attacks on protesters at the Turkish ambassador's residence "brutal".
Yesterday, the US State Department said "violence is never an appropriate response to free speech".
Ceren Borazan, who lives in East Rutherford, says a security officer put her in a headlock and threatened to kill her during a large altercation between protesters and Turkish security outside the embassy on Wednesday.
"The Turkish-Americans responded in self-defense", said a statement from the Turkish embassy.More news: Trump intends to renegotiate NAFTA as early as August
Borazan, a Turkey-born Kurdish, wrote in a separate statement on her Facebook account: "Today I experienced firsthand the extent and savagery of Turkish fascism: My Kurdish friends and allies were protesting peacefully against Erdoğan being in Washington when we were suddenly attacked by a group of Erdoğan's official bodyguards and secret police".
"It is critical that we are closely linked with partners on the ground to coordinate both military and civilian efforts to sustain momentum and focus against ISIS", Nauert said, using an acronym for Islamic State.
Two arrests were made and Washington, D.C. police said other suspects were being sought.
The incident has increased tensions between the USA and Turkish governments. He warned that senior USA diplomat Brett McGurk, in the anti-IS coalition, should not "poison" the administration by backing Kurdish groups.
"I'm still outraged at this Turkish beating", McCain said.More news: Old Navy helps Gap sail through retail gloom
Turkey considers the People's Protection Units, or YPG, in Syria a terror organization and an extension of the Kurdistan Workers' Party (PKK), which has waged a three-decade-long insurgency against the Turkish state.
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