Antonyms for the phrase "calls in question" could be words or phrases like "endorses," "affirms," "supports," "confirms," "validates," "upholds," "proves," "establishes," "verifies," and "corroborates." All of these words and phrases indicate belief or agreement, rather than skepticism or doubt. Instead of questioning the validity or truthfulness of something, they serve to reinforce and prove it. When a statement, theory, or claim is supported or confirmed, it gains credibility and reliability. The opposite of questioning is believing, and antonyms for "calls in question" are words and phrases that promote belief and validation.