The Swiss franc tracked the euro down against the dollar on Tuesday ahead of a Spanish bond auction and amid anticipation the Swiss government will decide this week on the new composition of the central bank's board. The euro touched two-month lows against the dollar on Monday ahead of Spanish bond auctions on Thursday. Any sign that 10-year yields are heading closer to 7 percent - a level regarded as unsustainable - could prompt further euro weakness.
The franc fell 0.2 percent against the dollar to trade at 0.9171 compared to the New York close. The franc was flat against the euro at 1.202.