In Act 2, scene 2, Isabella and Lucio came to plead Angelo. Toward the end of Act 2, scene 2, Angelo makes a long monologue to express his internal struggle. What is Angelo's struggle here?

Angelo's internal struggle is whether to pardon Claudio like Isabella had begges, or to keep his decision and punish him for his 'crime' of impregnating his lover Ju liet before their marriage.

Explanation:

In William Shakespeare's "Measure for Measure", the 'temporary' ruler of Vienna, Angelo had convicted Claudio of sexual immorality and had sentenced him to be put to death. This particular scene in Act II scene ii is when Claudio's sister Isabella had come to plead with the deputy to the Duke for mercy and pardon her brother's crime.

The monologue at the end of Act II scene ii shows Angelo conflicted between pardoning Claudio and his need to assert his power. He became attracted to Isabella and is conflicted between impressing her and his need to show the people of Vienna his own power / authority. This internal struggle within Angelo reveals his own past misdeeds but the need to be 'good' in public. He exclaims that "most dangerous Is that temptation that doth goad us on To sin in loving virtue". And just as Isabella's words claim "authority, though it err like others, Hath yet a kind of medicine in itself, That skins the vice o' the top." He knows that she speaks the truth and yet, he wants to show his authority over the people, thus deciding to punish Claudio.