The Trump Administration and Qatar have signed an MoU to combat financing of terrorism, with the US describing it as a major step, amid the increased isolation of the Arab state.
Four Arab states boycotting Qatar will pursue their commitment towards changing Doha's policy of financing and giving safe havens to terrorist organizations, the Egyptian foreign ministry has said.
Qatar's foreign minister Sheikh Mohammed bin Abdulrahman Al Thani said his nation won't comply with any demands that it considers a violation of international law.
Riyadh and its supporters have severed air, sea and ground links with Qatar, cutting off vital routes for imports including food.
The four Arab nations, which also include the United Arab Emirates, Bahrain and Egypt, accuse Qatar of supporting extremism, a charge which it denies.
A deadline was extended Monday for Qatar to accept 13 demands by several Arab states in return for lifting a de facto blockade.
Saudi Arabia, the United Arab Emirates, Bahrain and Egypt agreed to give Doha an extension to respond positively to their demands.
He was to meet later with Kuwait Foreign Minister Sheikh Sabah Khaled Al-Sabah, who has sought to work resolve the standoff.
Al-Jazeera Arabic account described the move as part of an "organised campaign" targeting it. Al-Jazeera has said it has come under cyberattack as well amid the diplomatic crisis.