It is also not affordable for many US students who would like to go there and can’t afford it. They also hope to gain scholarships to attend. It is very competitive but even worse for non-citizens who do not qualify for any government funding.
Why did you select this specific university? Because of the name? Location? Reputation for politics? What do you hope to do with your political science degree?
There are several thousand universities in the US. Many do teach political science. Many are better and less-expensive than GW. You need to do some more research and find some affordable schools that you will like attending if you are admitted.