many of them echoing calls from congressional democrats to open an impeachment inquiry into president trump. laura ingal is live in our new york city newsroom with more. >> reporter: it's a busy weekend for many of the 2 23 democratic presidential candidates, out and about this holiday weekend. it's about rallies, campaign stops and poll numbers. for some, creating momentum for an impeachment investigation into president trump. at least 10 democrats in the crowded field of contenders have been talking about the possibility of impeachment for reasons ranging from defying congressional subpoenas issued to members of his administration and obstruction of justice. congressman seth molton and bernie sanders most recently making that argument. >> the congress has every right to subpoena and it is the job of the administration to attend the hearings that the congress is calling. if he doesn't understand that, it may well be a time for an