QUESTION: Cost of immigrants to US taxpayers

Does immigration, including illegal immigration really cost US taxpayers as much as the right-wing claims? What about all the money paid into social security that isn't taken out by undocumented immigrants? Specific numbers for Washington State would be most appreciated. We are having a public hearing tonight on the impact of the Minutemen Project on our community in Bellingham, WA and the President of the Minutemen is expected to attend from AZ.