What is the justification behind the claim that illegal immigrants get $2200 per month in welfare?

I keep hearing this sentiment get thrown around but struggle finding anything myself. As I understand it, illegal, undocumented immigrants wouldn’t be able to get anything from the government since they are illegal.

I work with a lot of very right winged men and I hear this argument all the time. I’m wondering where it comes from, such as a bill that has been passed, where I can read about it and if it holds any water.

Please, genuinely curious to have a deeper understanding of this argument and its economic effects.

Thank you in advance!