u.s. midterm elections and each of the last three u.s. presidents is on the campaign trail to rally voters in hopes of winning power in congress. record heat across the u.s., over 70 high-temperature records are expected to be broken across the country on monday. a surprising admission by iran, how they ve helped russia with the war in ukraine, after weeks of denial. live from cnn center, this is cnn newsroom with laila harak. they may potentially shift the balance of power in congress after voting. this tuesday, every single seat in the house will be at play while in the senate, 35 positions are up for grabs. right now, democrats controlled both chambers by a thin margin and if republicans take control of either one, they could restrict president joe biden s agenda for the next two years. the outcome could be decided in any one of these six states. five of them are battlegrounds that mr. biden flipped in 2020, including georgia where early voting numbers have been
very next very, very, very short period of time, you re going to be so schaappy, okay? [ cheers ] for the first time, this election season u.s. president joe biden and former president barack obama stood side by side at a campaign rally. the rare join the at appearance in philadelphia drove home the point that pennsylvania s senate seat is considered a must-win for democrats on tuesday. cnn s fill phil mattingly has our report. reporter: there s no more important state than the state of pennsylvania and there s no more important city than the city of philadelphia. it is where democrats run up huge numbers. it is a bash tian of support. the current president joe biden was there as well. take a listen. i lived in pennsylvania