He pointed to U.S. intelligence and logistical support to the Saudi-led campaign against Houthi rebels.

“I think that many of the myriad mutual interests that have sustained this relationship since the 1940's will sustain it for the future,” Nazer predicted.

White House officials agreed the two sides would continue to work as partners to combat terrorism, help secure the region and counter Iran’s destabilizing actions.

"I don't think that there can be any confusion or ambiguity about who is our partner in the region and who isn’t," Malley said.

After the summit, officials are expected to announce new defense assistance for the GCC and increased cooperation.

Defense capabilities

White House officials say the assistance will include a simplified process for transferring defense capabilities to Gulf nations, plans to boost the GCC’s ballistic defense missile defense system and increased defense against cyber threats.

Expectations for significant outcomes from this summit are low, especially during a presidential election year.

“The Saudis obviously are looking at a situation where you have presidential candidates that as yet have not really provided any clear indication as to what the United States will be as an ally in the future.” Cordesman said.