The document reportedly emphasizes the importance of maintaining a dialogue between the Russian and USA heads of state, diplomats, militaries, and intelligence agencies, and calls for closer economic ties and more contact between Russians and Americans.
He added: "NATO countries must pay MORE, the United States must pay LESS".
The resignation came just weeks ahead of Wednesday's summit, highlighting Trump's policies are not only dividing United States allies, but also senior USA officials.
Trump, who has compared the sentiment that underpinned the Brexit vote to leave the European Union to his own election, will be making his maiden presidential trip to Britain at a fraught time for May. John Thune of South Dakota, the third-ranking Senate GOP leader, explained why the motion was needed.
'I'm confident the UK-US alliance will play a leading role in advancing our shared values of democracy and freedom, ' he said. "I mean this is something that has served freedom-loving countries well for half a century".
Two GOP senators, Mike Lee of Utah and Rand Paul of Kentucky, voted against the measure.More news: George Clooney injured in auto accident, reports
"Not fair to the US taxpayer", he continued, before again pointing to the USA trade deficit with the European Union.
Lee's office did not immediately respond to a request for an explanation why the Utah senator voted against the measure. "On top of that we lose $151 Billion on Trade with the European Union".
In a letter last month, U.S. Secretary of defense Jim Mattis wrote to British defense Secretary Gavin Williamson threatening to replace Britain with France as Washington's closest military ally if London did not further increase military spending.
Donald Trump has finally said something that I actually agree with. But NATO members, including Germany, argue they have boosted contributions as part a pledge to kick in at least 2 percent of annual economic output by the middle of the next decade.
During a phone call with Russian President Vladimir Putin in March, President Donald Trump reportedly sought to ease Putin's concerns that White House officials were trying to block a conversation between the two.
This week's summit of the 29-nation North Atlantic Treaty Organisation takes place amid a deterioration in US relations with the rest of the world as a result of Trump's protectionist stance on trade and withdrawal from worldwide agreements to fight climate change and prevent Iran from developing nuclear weapons.
Numerous same nations that failed to contribute more to the collective defense agreement have simultaneously grown their respective social welfare and migration programs.