Grand jury testimony represents a new marker in an investigation that is offering increasing signs of the potential legal peril ahead for Donald Trump and some of his associates.

• Trump lawyer Rudy Giuliani is expected to make a Tuesday appearance in Atlanta.
• Sen. Lindsey Graham, R-S.C., is scheduled to appear Aug. 23, but he's challenging the demand.
• The demands for testimony from high-profile figures suggests the probe has found its focus.

There are few more loyal allies to former President Donald Trump than Rudy Giuliani, John Eastman and Lindsey Graham.

All have emerged as key figures in Trump's failed efforts to cling to power and each now face looming August dates to testify before a special grand jury in Atlanta as part of a fast-moving criminal investigation into interference in the 2020 election.

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