The U.S.is also concerned that the spat among Arab governments could hamper a shared interest in blunting Iranian assertiveness in the region.
If we don't solve it, I will be a mediator right here in the White House.
The Saudi-led bloc has also imposed sanctions against the tiny Persian Gulf country, including restrictions on Qatari aircraft using their airspace.
The row has split key USA counter terrorism partners and undermined the cohesion of the Gulf Cooperation Council, a traditional bulwark of US -led efforts to contain Iran's influence.
Mr Trump griped to a group of NY and New Jersey politicians after his press conference with the Kuwaiti Emir, sources present told Politico. "We will be most successful with a united GCC", he said.
Kuwait is a staunch American ally trying to mediate a festering diplomatic crisis involving Qatar and its Arab neighbors.
Trump did say on Thursday that the White House was prepared to be directly involved in mediation efforts if the crisis is not resolved quickly.
His comments came after he sent conflicting signals about where he stands on the dispute. But the dispute has dragged on.
President Donald J. Trump will welcome Amir Sabah al-Ahmed al-Jaber al-Sabah of Kuwait to the White House for an official working visit on September 7, 2017. He noted Qatar had been presented with a list of 13 demands by the other countries and was willing to discuss them.
Saudi Arabia, Bahrain, the United Arab Emirates and Egypt announced on June 5 they had cut diplomatic and economic ties with Qatar, accusing it of having ties with Shiite Iran and fundamentalist Islamist groups.
The meeting will address bilateral relations and regional and worldwide developments of mutual interest, and cooperation in the fight against terror will figure high on the summit's agenda, the envoy said, stressing that Kuwait is a major partner to the USA in the war on terror. It denies funding extremists.