Republican presidential nominee Donald Trump has signalled he may drop his proposal to deport 11 million people who are living illegally in the US.
His campaign manager Kellyanne Conway said the mass deportation plan, which was a central plank of his campaign, was yet "to be determined".
Her comments at the weekend came after Mr Trump met with a new panel of Hispanic advisers.
He told Fox News on Monday he was not "flip-flopping" but wanted a fair plan.
"We want to come up with a fair but firm process. Fair but firm," he said, without giving specifics.
The businessman was scheduled to deliver a speech on immigration in Colorado on Thursday but his campaign team told US media on Monday afternoon that it has been postponed.
Mr Trump has taken a hardline stance on immigration since the beginning of his campaign, vowing to create a "deportation force" as well as make Mexico pay for the construction of a wall along the US-Mexico border.
While struggling to keep up with Democratic rival Hillary Clinton in the polls, Mr Trump has addressed black and Hispanic voters in recent days with the aim of broadening his support beyond white working-class voters.
"What he supports is to make sure we enforce the law, that we are respectful of those Americans who are looking for jobs, and that we are fair and humane to those who live among us," Ms Conway told CNN on Sunday.
When asked to clarify if Mr Trump would maintain his position on creating a deportation force, Ms Conway responded: "To be determined."