The talk of Washington is still centered on the news from last week that President Donald Trump fired FBI Director James Comey.
"I think the likelihood of Republican defections for Cornyn is really low", Mackowiak said.
Cornyn, the Senate's second-ranking Republican, was expected to speak at the Houston HBCU's ceremony on Saturday.
Senate Judiciary Chairman Chuck Grassley, R-Iowa, said he'll put a high premium on independence from the president.
Kelly did not immediately respond to Fox News' request for comment.
Schumer also said he supports calls to block a nomination until a special prosecutor is appointed to take over the investigation.
Cornyn's decision came on a day when the White House found itself embroiled in yet another controversy, this one centered on whether Trump had improperly shared intelligence data with Russian diplomats in the Oval Office the day after he fired Comey. Other possibilities being considered apparently include former Justice Department lawyer J. Michael Luttig, Republican congressman Trey Gowdy of Benghazi-investigation fame, and former Republican congressmember (and former FBI agent) Mike Rogers, who once chaired the House Intelligence Committee.
Fisher is a former assistant USA attorney general in charge of the Justice Department's criminal division and is now a partner in Latham & Watkins' Washington, D.C. office.
If he had been chosen, it would have created political upheaval in Texas with both parties fighting for his Senate seat. He's active on Twitter, where he often personally posts articles critical of Democrats.
Cornyn, 65, is the Senate majority whip and formerly served as a Texas attorney general and state supreme court justice.
Former NYPD Commissioner Ray Kelly is still on the shortlist, and could face less Democratic obstruction in a Senate confirmation process - Senate Minority Leader Chuck Schumer, D-N.Y., endorsed Kelly to lead the Federal Bureau of Investigation in 2011 when Robert Mueller stepped down. Lindsey Graham, R-S.C., said that while Cornyn would be a "superb choice" to lead the agency under normal circumstances, "these are not normal circumstances". But Democratic strategists have already put senators on notice they would hold their feet to the fire in voting against Cornyn. The bill died in the Senate over conservative opposition, and Sessions has ordered the Department of Justice to be tougher, not more lenient on criminals.
There's also the issue of Cornyn's political future.
Cornyn has in recent weeks become more of an outward defender of Trump.
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