The phrase "a core pledge" is correct and usable in written English.
It can be used to refer to a fundamental promise or commitment that is central to a particular agreement or initiative.
Example: "The organization has made a core pledge to reduce its carbon footprint by 50% over the next decade."
Alternatives: "a fundamental promise" or "a key commitment".
It has proven to be politically beneficial to the party, weakening Obama on a core pledge and incurring no reprisal.
The resulting chaos is alienating U.S. partners in Europe and Asia while calling into question Trump's ability to deliver on a core pledge to rebalance U.S. trade policy to benefit American workers.
On the campaign trail, Trump called NATO "obsolete" and questioned whether the U.S. would intervene to defend NATO allies who came under attack — a core pledge under the mutual defense treaty — if those countries had not met the alliance's target of spending 2percentt of their GDP on defense.
That had been a core campaign pledge of Mr. Bush's.
The stalled Republican effort to pass a sweeping rewrite of the Affordable Care Act was further threatened Sunday when Republican senators from opposite sides of the party's ideological spectrum voiced their disapproval, imperiling hopes for a Senate vote this week and President Trump's chance to fulfill a core campaign pledge.
But Trump's 11-minute speech fulfilled a core campaign pledge, one crucial to some conservative Jews and evangelical Christians in his base who believe the U.S. must do more to support Israel.
I mentioned reports that he might be backing away from his core pledge for mass deportations of America's eleven million undocumented immigrants.
It recommitted to its core pledge to defend each member, as expressed by Obama's promise that the United States would be willing to go to war with Russia to protect tiny Latvia, Lithuania and Estonia.
There were a total of 19 core pledges agreed.
If Trump intends to expel the country's undocumented immigrants—one of the core pledges of his campaign Kobach is a natural ally.
One of the core pledges to which Pizza Hut signed up was: "We will encourage and enable people to adopt a healthier diet".
