Why Congress Can Impeach Obama

NOW that President Obama has granted legal relief to as many as five million undocumented immigrants, Republicans are thrashing about for an effective response. Only a few hard-liners are talking about impeachment now, but more could join them out of frustration with their other options.

Many people in both parties have tried to quell such talk by saying the president is within his powers to issue the order. The problem is, the pro-impeachment Republicans are right: There is a plausible case for taking that step.