Vice President Kamala Harris predicted former President Donald Trump’s running mate will likely be a “rubber stamp,” specifically someone who prioritizes loyalty to him over the country.

Harris’s statement comes a few days after Trump stated he knows who his vice presidential candidate will be and that this candidate will “most likely” be at the first presidential debate scheduled for Thursday. When asked about who her opponent in the vice presidential debate will be, Harris claimed she does not spend much time thinking about this but argued there’s “a litmus test” over who Trump would pick.