White House press secretary Jen Psaki on Monday defended the Biden administration’s decision not to require negative COVID-19 test results or proof of vaccination from people illegally crossing the U.S.-Mexico border. Psaki, responding to a question from a reporter on whether border patrol officials ask to see proof of vaccination against COVID-19 or negative test results “if somebody walks into the country, right across the river,” said illegal immigration is not comparable to foreign nationals who arrive by airplane to the United States. The question was prompted by the White House announcement on Monday that all foreign visitors need to be vaccinated and present proof of their vaccination before boarding a U.S.-bound flight. White House COVID-19 coordinator Jeff Zients said at a press conference that individuals also must show a negative COVID-19 test at least 72 hours before flying. “As individuals come across the border, they are both assessed for …