won't do · unable to · (at the end of a rhetorical question) can that be?

Can't we work this out?

Perhaps he'll never become famous.

In this country, we rise or fall as one nation, as one people. Let's resist the temptation to fall back on the same partisanship and pettiness and immaturity that has poisoned our politics for so long.

There will be setbacks and false starts. There are many who won't agree with every decision or policy I make as president. And we know the government can't solve every problem.

Being challenged in life is inevitable, being defeated is optional.