Communications Minister Jorge Rodriguez went on state television Saturday alleging that Roberto Marrero was the ringleader of a plot to bring hitmen from Central America to Venezuela to carry out assassinations.
He showed screen grabs of cell phone conversations that he said are proof Marrero was orchestrating the hitmen's payment.
Marrero was taken from his home in the middle of the night by masked agents Thursday in a dramatic operation that has drawn international condemnation.
President Nicolas Maduro has refrained from having Guaido arrested, but analysts say Marrero's detention was a clear attempt to weaken his political foe.
Guaido characterized the operation as a sign that Maduro is losing his grip on power.
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