and what could be a breakthrough in a hugely divisive debate. that s where we start this hour, immigration. specifically, immigration reform. it has been a very tough slog, even before the political landscape turned so incredibly toxic. but now this bipartisan group of senators on your screen, they re unveiling a wide ranging compromise that includes a so-called path to citizenship for roughly 11 million immigrants who are in this country illegally. the senators are due to brief reporters this afternoon. give us some of the details. all of this one day before president obama unveils his own ideas in las vegas. joining me now with more on both fronts cnn chief congressional correspondent dana bash and also our white house correspondent brianna keilar. dana, i want to start with you. walk me through the details here and why this seems like such a surprise. well, let s start with some of what is in this bipartisan proposal. first, what they call, we re using their words for a