The dollar slipped away from a three-week peak against a basket of currencies on Tuesday as forex investors awaited congressional testimony by Federal Reserve Chair Janet Yellen. Investors are keen for clues to the pace of the central bank's interest rate increases.

The dollar index fell a quarter percent on the day to 100.70, edging away from Monday's high of 101.11, which was its highest peak since Jan. 20.

USD/JPY fell more than 0.2 percent to 113.23, below Monday's high of 114.17 but well above a 10-week low of 111.59 yen touched a week ago.

Yellen will present the U.S. central bank's semi-annual report on monetary policy and the economy in testimony to the Senate Banking Committee on Tuesday, followed by a the semi annual monetary testimony before the House Financial Committee on Wednesday.

EUR/USD bounced back to 1.0625, after it came under pressure in recent sessions as France's election campaign has heated up. The pair was up 0.25 percent to 1.0626.

French presidential front-runner Emmanuel Macron is being targeted by Russian media and internet attacks from within Russia with the goal of helping the election campaigns of his pro-Moscow rivals, his party chief said on Monday.