Interest in Watergate, the US political scandal that brought down a president half a century ago, is making a revival if recent weeks in Washington are any guide.

As Democrats debate whether to try to impeach Donald Trump, their first star witness on the House Judicial Committee review of the Mueller Report into Russian interference in the 2016 campaign earlier this month was none other than John Dean.

Dean was the White House counsel whose testimony in 1974 helped fell his boss, Richard Nixon.

Room 214 of the Watergate Hotel goes for a 'scandalous' $US1300 ($1885) per night, and includes Nixon era knick-knacks. Credit:Peter Hannam

Down at the Watergate complex - site of the infamous break-in of the Democratic National Committee (DNC) - old conspiracies were getting the odd prod too.