reeling from the mass shooting in uvalde, texas, that killed 19 children and two adults, shaken by another mass shooting at a hospital complex in tulsa, oklahoma yesterday that left four people dead. they found the first victim, then the next victim. reporter: biden plans to call on congress to take action, as lawmakers try to hammer out gun reforms. so far, biden wary of giving too much optimism. are you confident congress will take action on gun legislation, sir? i served in congress for 36 years. i m never confident, totally. it depends. and i don t know, yi don t know about the negotiations going on. reporter: during his visit to uvalde, the president hearing pleas for change in washington. earlier in the month, he had traveled to buffalo, new york, the site of another mass shooting that left ten dead at a local supermarket. the shooter targeting the black community. i promise you, hate will not prevail and white supremacy will not have the last word. but evil