Thomas Kean Jr. on a bipartisan trip to Kyiv, Ukraine, in 2024. Photo: Serhiy Morgunov/Global Images Ukraine/Getty Images For months, a Republican congressman has been absent from Capitol Hill due to an undisclosed medical issue. There is no clear return date in sight, and a series of new reports has prompted only more questions about the lawmaker’s condition. Representative Tom Kean Jr. of New Jersey, 57, last cast a vote in the House on March 5. Kean, who is running for reelection to a third