For FY 2017, the United States provided some 1.3 billion US dollars in bilateral foreign assistance and 200 million dollars in Department of Defense support to Jordan's Armed Forces.
United States officials agreed on Friday that most of Tillerson's discussions will likely be hard, saying those with NATO-ally Turkey will probably be especially prickly, given Turkish military action against US-backed Kurdish rebels in northern Syria and escalating anti-American rhetoric in Ankara.
The US is not expected to make a direct governmental contribution at the conference, however.
The White House is asking Congress for $300 million "to train, equip, sustain and enable" vetted Syrian opposition groups to defeat the Islamic State.
The United States has become more embroiled, diplomatically and militarily, in regional conflicts since President Donald Trump took office more than a year ago.
The State Department says US citizen Serkan Golge, a NASA scientist who was arrested in July 2016, was convicted "without credible evidence" on February 8 by Turkish authorities for being a member of a terror organization.
He also said the US needs to work with Turkey to avoid any conflict with the North Atlantic Treaty Organisation ally. While the United States is expected to announce a $3bn package through the Export-Import Bank, pledges so far have fallen well short of the almost $100bn Iraq says it needs. The operation is carried out against Kurdish SDF-affiliated People's Protection Units (YPG), which Ankara believes have links to the Kurdistan Workers' Party (PKK), designated as a terrorist organization in Turkey.
The chief US diplomat will also lead a delegation to the ministerial meeting in Kuwait of the 74-member Global Coalition to Defeat ISIS. "ISIS remains a serious threat to the stability of the region, our homelands and other parts of the globe".
Washington's top envoy on Tuesday called on allies to keep fighting the Islamic State group, saying that the end of major combat did not mean "enduring defeat" of the extremists.
Turkey's hardly the only distraction.
The Israeli strikes came after the military said it had intercepted an Iranian drone crossing the Syria-Israel border, according to RFE/RL.
Mr Tillerson meanwhile said the proposal was "fairly well advanced" but would not comment on when the administration might put it forward.
Speaking at a meeting of his counterparts in Kuwait City, Tillerson representatives from more than 70 nations that the coalition will not stop, "until we have achieved the full and enduring defeat of ISIS (Islamic State)".
US Secretary of Defense Jim Mattis sent a letter to North Atlantic Treaty Organisation last month calling for a formal North Atlantic Treaty Organisation train-and-advise mission, Reuters reported, part of President Donald Trump's campaign for the alliance to do more against militants. He said the large number of USA -backed forces and rising Islamic State group casualties are proof such claims aren't true.