In recent weeks, Ivan Duque's wife visited the islands of San Andres and Providencia, and the northwest department of Choco, attending to the victims of rainy season floods.
The flooding brings the death toll from more than two months of torrential rains ravaging Colombia to 27, with thousands of people flooded out of their homes.
The pause means the online enrollment system has been closed for the 60,000-patient clinical trial while the independent patient safety committee is convened.