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Thank you so much, and welcome to the beat. Im ari melber. Tonight washington and the nation are honoring Capitol Hill Police officer brian sicknick. Laid to rest in Arlington National cemetery after dying defending the capital. And many say democracy itself. Lying in the Capitol Rotunda is an honor usually reserved for former officials. He is only the fifth private citizen to be honored this way, joining people like rosa parks. Against the backdrop of these solemn ceremonies is the fallout over...

these bombs today exploding feet from the iranian generals tomb. the questions still tonight is who did it. im kaitlan collins, and this is "the source." tonight, donald trump has officially filed that appeal to overturn last months explosive ruling from colorados high court that declared he was ineligible to appear on the states primary ballot, determining that he had engaged in an insurrection. the new appeal tonight is only raising new pressure on the nine justices that you see here...

was targeted. and were getting a disturbing look at the moment that suspect who police say is a transgender person and a former person at the school shoots out the schools windows and walks inside to carry out the attack. were also learn much more about the six victims. three students, just nine years old and three adults in their 60s, including the head of the school. the lost, once again, renewing calls to do something to prevent the next shooting. the mayor of nashville sharing this...

in the south, the white house promising help for the communities ravaged by powerful tornadoes this weekend. were live in one of the hardest hit areas. plus new details surrounding the grand jury investigating the hush money payment made during the 2016 campaign. who just testified and what he could say. were live in paris thousands of protesters are blocking trains and streets once again over the plan to raise the pension age. we begin this very busy hour with the latest on the ...

but its battleground pennsylvania where some last-minute twists are shaking up what was already one of the closest-watched senate primaries in this cycle. welcome to "mtp daily," im garrett haake in for chuck todd. as we learn more about the suspect and victims in the mass shooting in buffalo, we find ousts in depressingly familiar territory asking what, if anything, could have been done to prevent this massacre. and what can be done to prevent even more tragedies from happening in t...