the United States isn’t party to

NewAmerica

Banned
Mandarin
Are both "the United States isn’t party to" and "the United States isn’t a party to" correct in grammar?

Thanks in advance

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The treaty, the centerpiece of President Barack Obama’s “pivot to Asia,” set new standards for environmental and labor laws. It also was an explicit attempt to prevent China from writing “the rules of the road” for international economic policy, given that China has been simultaneously shaping a separate 16-country Pacific trade deal that the United States isn’t party to.

-The Washington Post

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