The commander said while the original 34,000 square miles of territory held by the terrorist group has been reduced to less than 20 square miles, Daesh still retains leaders, fighters, facilitators and resources.
Votel said that a "key task" for the USA during the withdrawal will be "the protection of those who have fought valiantly with us and ensuring that they remain safe as our diplomats and United Nations and others pursue a political solution here in Syria".
Mr Trump's December announcement about withdrawing troops from Syria came as a shock to both United States allies and his own officials.
Votel added that he was "not consulted" on the matter, and warned that the terrorist group known as the Islamic State still remains a threat, echoing recent reports from other top intelligence officials.
"Absent sustained (counterterrorism) pressure, ISIS could likely resurge in Syria within six to 12 months and regain limited territory", the report from the Pentagon's inspector general said.
Trump's decision to leave Syria, which he initially said would be rapid but later slowed down, shocked USA allies led to the resignations of Defence Secretary Jim Mattis and the top envoy to the anti-ISIS coalition, Brett McGurk.
The bill would allow USA states and cities to decline to do business with American companies that take part in a campaign to boycott and divest from Israel in order to pressure the Jewish state to alter its policies with regard to Palestinians and Israeli settlements.
Unmoved by the rare opposition from his very own party, President Trump, during a recent television interview, insisted that his promise to bring U.S. troops home was "a big part" of the reason that he was elected.
Cuban says Mavs want Kristaps Porzingis, Luka Doncic for long haul
We just know each other from playing against each other for a long time. "Every relationship takes time to build", Porzingis said. The New York Knicks are planning for something big this summer.
The move is the latest blow to President Trump after lawmakers passed other symbolic motions denouncing US support for the Saudi-led military intervention in Yemen and calling for sanctions to be imposed on Riyadh due to the involvement of Crown Prince Mohammad bin Salman in the murder of journalist Jamal Khashoggi.
"We're at 99 percent right now, we'll be at 100", he said on CBS' "Face the Nation".
US officials said that ISIS fighters hold only several villages in the Middle Euphrates River Valley, but added they don't expect that area to be cleared of militants for another several weeks, at best.
A source close to Trump said the president will declare the militant group all but defeated and will discuss his planned Syria drawdown.
The Defence Department watchdog report warned that even with the ISIS forces on the run, the militant group "is still able to co-ordinate offensives and counter-offensives, as well as operate as a decentralized insurgency".
The report, citing information from US Central Command, said Islamic State would portray the withdrawal as a "victory" and conduct attacks on American personnel during the pullout process.
That pronouncement, however, seems to be opposed by many analysts, intelligence officials and politicians, including close allies of the ruler, who expressed concern about the impact the withdrawal may have on the US role in the Middle East. In general, he said officials were "aware that he had expressed a desire and intent in the past to depart Iraq, depart Syria". The aim of the conference is to recommit the coalition to that aim and ensure that the departure of US troops does not overly complicate that mission.
Trump himself is expected to speak to the gathered foreign ministers at the State Department-hosted conference on Wednesday is widely expected to reiterate and expand on his anti-Islamic State message from the State of the Union, officials said.