US Politics in 60 Seconds: Trump's new Chief of Staff

This week, the process of impeaching President Trump entered the critical phase as the House of Representatives held its first public hearings. The battle lines are now drawn.

The Democrats say that there is compelling evidence that Trump withheld badly needed military to aid to an ally at war to pressure that country's government to provide him with personal political benefit by helping him discredit a political rival.

The Republicans say that the evidence comes mainly from witnesses with little or no direct contact with the president, and that the military aid was delivered to Ukraine without the Ukrainian president taking the actions Trump is alleged to have demanded.

The fight for the Nile: In recent days, the Trump administration has tried to mediate three-way talks between Egypt, Sudan, and Ethiopia on their long-running dispute to access the waters of the Nile. In short, a 1929 treaty gave Egypt and Sudan rights to nearly all Nile waters and the right to veto any attempt by upstream countries to claim a greater share. But in 2011, Ethiopia began work on the so-called Grand Renaissance Dam on the Blue Nile tributary from where 85 percent of the Nile's waters flow. The project, due for completion next year, will be Africa's largest hydroelectric power plant. Egypt, which draws 85 percent of its water from the Nile, has made threats that raised fears of military action. We're watching as this conflict finally comes to a head early next year.