good evening. m bret baier.n president joe biden vacations in thcae caribbean s republican presidential candidates returned to then campaign trail. police in texas investigate the deaths of a pregnant teenager and her boyfriend, and what they call a perplexing case. the doctors are warning about a triple-demic is a new covid strain spreads across the united states.firs dr. marc siegel joins us to nighdiscuss. but first, breaking tonight, another massive group ofthro migrants is making its way through mexico as immigrationy officials work to process the thousands already waiting at thn border. many of those who have been allowed to enter the u.s. are being sent further north where local officials say president joe biden and his administrationir have ignored their pleas for additional assistance. the president meanwhile is heading south to the caribbean for vacation as his top cabinet officials meet with mexico s president to discuss the crisis. we have fox team coverage, c