Working for company in Kenya but based in the US, not a citizen but a resident in US. Do i get double taxed as my employer withholds tax from my gross salary.

I work for a company that is based in Kenya and I get paid directly from them but they withhold tax from my gross salary. They said I will receive a Withholding Tax Certificate every 3 or 6 months so that I can claim or be exempt from taxes here in the USA. I am not a US citizen but I am a resident in the US with a work permit and social security. I work in the US for this company. My question is do I actually get to claim back the withheld taxes that is being deducted from my gross salary? Or do I have to pay taxes here in the US too which means I will be double taxed?