Maduro is clinging to power, even as Trump's envoy for Venezuela, Elliott Abrams, told Congress this month that the administration maintains "the current political and economic environment is unsustainable and he will not be able to weather it much longer".
Millions of people have already fled the border to seek a better life as a food and medicine shortage cause a major crisis. "You will lose everything". Analysts say that would seriously undermine Maduro's authority and could lead to his ouster.
Another US aircraft is due in Curacao from Miami on Tuesday, and a collection center for Brazilian aid will open Monday on the border, Mr Guaido's team said.
Trump offered strong backing for Venezuelan opposition leader Juan Guaido, who the United States, many of Venezuela's neighbors and most Western countries have recognized as interim president of Venezuela.
Mr Maduro, who denies the existence of a humanitarian crisis, dismisses the opposition moves as a "political show" and a cover for a United States invasion.
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Most of the recent headlines have been about Meghan's father. "Please allow us to live our lives in peace". Meghan Markle is due to give birth in April.
But Maduro, who won a second term past year in an election that critics denounced as a sham, retains the backing of Russian Federation and China and control of Venezuelan state institutions including the security services.
Rubio and Diaz-Balart, also a Republican from Florida, toured a relief center at the border and visited the Simon Bolivar Bridge that separates the two countries where they met with officials of the Venezuelan National Assembly, Rubio said in Twitter postings.
Russian Federation and China, among a spate of other nations, say that they recognise Maduro as Venezuela's only legitimate president.
South Florida is home to more than 100,000 Venezuelans and Venezuelan-Americans, the largest concentration in the country.
The Florida Republican's visit comes after a second US cargo of humanitarian aid arrived at the Colombian border on Saturday to help alleviate a burgeoning crisis.
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Railway authorities say the train is expected to reduce the 850-kilometre journey between the two cities from 14 to eight hours. The train's top speed is limited to 130 kmph in this route and averages 95 kmph.
On Monday, Trump said Maduro and the "small handful at the top of the Maduro regime" have stolen from Venezuela.
A successful peaceful transition to democracy in Venezuela would help promote democracy in Nicaragua and Cuba.
Last month, national security adviser John Bolton stood in front of the White House press corps with a legal pad that said "5,000 troops to Colombia", a note the White House declined to clarify beyond the president's remarks that all options are on the table.
Branson said it is not funded by any government and that all artists are performing for free, hoping to raise donations from viewers watching it on a livestream over the internet.
Biggest supermoon of the year is here
You won't need to use any special equipment to see the super moon - it'll be huge! The moon will be officially full at 10:53 a.m. For those who can't catch Tuesday's supermoon, a third supermoon of the year, nicknamed the worm moon, can be seen on March 21.