The chairman of the US Senate Foreign Relations Committee has said he will block arms sales to the Gulf Cooperation Council states to help resolve the current dispute between Qatar and its neighbours.
The four Arab countries said they would not normalize relations until Qatar complied with 13 demands, among them cooling its relations with Iran and closing the Qatari-state-funded Al Jazeera news network.
Corker's committee and its counterpart in the lower chamber, the House foreign affairs committee, have the ability to review arms deals once the executive branch officially proposes them.
Congress has the power to block individual sales during a 30-day review period from when the state department gives notification of an impending sale. One of the demands is for the Turkish military base in Qatar to be closed.
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Last month, a motion to halt sale of about $500m of precision-guided munitions to Saudi Arabia as part of the $110 bn arm deal signed in May in Saudi Arabia was narrowly defeated.
Gabriel told an event hosted by the European Council on Foreign Relations in Berlin that Germany remained in close touch with all sides to try to reduce tensions resulting from the biggest diplomatic crisis in the region in years.
The foreign minister also said there were now no negotiations with Qatar over the demands.
They accused Qatar of "sponsoring terrorism", allying with Iran, and hosting "fugitives" wanted by Saudi Arabia or its allies.
Erdogan rejected the call to remove Turkish troops outright.
A State Department official issued a statement to CNN: "As a matter of policy, we do not comment or confirm the status of proposed defense sales until they are formally notified to Congress" and referred to Tillerson's Sunday statement in which he encouraged Qatar and the other countries involved in the dispute to meet to resolve the crisis.
In a Wall Street Journal interview on Sunday, Secretary Tillerson, who has called for mediated peace as the side address their grievances, addressed these demands saying "While some of the elements will be very hard for Qatar to meet, there are significant areas which provide a basis for ongoing dialogue leading to resolution".