On Wednesday, former special counsel Robert Mueller will testify before Congress, giving Democrats and Republicans a chance to grill him about his investigation into Russian interference in the 2016 election and ties to the Trump campaign. It's one of the most anticipated congressional testimonies in years, and will put the Russia probe back in the spotlight.

Mueller's appearance on Capitol Hill will also highlight the Democrats' divide over how to take on President Donald Trump ahead of 2020. A new poll from PBS NewsHour, Marist and NPR showed most left-leaning voters care more about beating Trump in 2020 than nominating a Democratic candidate who shares their values.

It'll be a busy week in politics. Tamara Keith of NPR and Amy Walter of the Cook Political Report are on hand to break down the news. It's Politics Monday: Their expert analysis is one click away!