Politicians ___ to be completely honest and transparent. shouldn’t do should ought should

The correct options would be:

1. Politicians should be completely honest and transparent.
2. Politicians ought to be completely honest and transparent.

Both "should" and "ought" fit grammatically and contextually in this sentence.

"Shouldn't" would indicate that politicians are not expected to be honest and transparent, which changes the meaning. "Do should" is not a grammatically correct phrase.