Shameful and appalling. That's how Senate Democratic leader Chuck Schumer described President Trump's performance at the Helsinki summit with Russian President Vladimir Putin. Schumer accused Trump of embracing an adversary and called it thoughtless, dangerous and weak. Schumer said Trump should have confronted Putin over Russian interference in the 2016 presidential election. He argued that Trump is "giving away the store" to Putin. Schumer challenged congressional Republican leaders to stand up to Trump and to impose a new round of sanctions on Russia.