ProPublica is tracking the historic rise in challenges filed by immigrants claiming their detention is illegal.

The former Texas Rangers first baseman has poured $2.5 million of his own money into the race and recently scooped up the key endorsement of President Donald Trump.

Our newsroom is trying new things to help Texans vote with confidence this spring. We want to demystify the process, the candidates and the offices of this year’s Texas primaries.