challenge for something

Then when you challenge him for the leadership you'll be sure to win.

The results could not be challenged for at least three years.

"Are there no others left who wish to challenge him for the right to the girl?"

School, he says, is simply not challenging enough for him.

Many of the parts are challenging for teachers to play.

There is no record of Washington having been challenged for this.

Now who would like to challenge him for the world championship?

The last two years of a second term are challenging for any president.

"They say he might even challenge for the championship next year."

"This is going to be challenging for the industry to meet, but we feel they can do it."