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President Obama on Tuesday put Gen. John Allen’s nomination for the top commander of NATO in Europe “on hold” in the wake of Allen’s alleged role in the scandal engulfing former CIA director Gen. David Petraeus. Allen, the commander of U.S. and NATO troops in Afghanistan, is under investigation for allegedly sending 20,000 to 30,000 “potentially inappropriate” emails to Jill Kelley. Kelley is the woman who allegedly received threatening emails from Paula Broadwell, who was having an affair with Petraeus—and the FBI investigation into those emails triggered its investigation in Petraeus, which ultimately led to his resignation last week. Defense Secretary Leon Panetta said on Monday that Allen would remain in his position until the confirmation of Marine Gen. Joseph Dunford, his likely successor.