Critics have been pleased to see shifts in Trump's campaign positions, but this has upset some of his supporters. However, Trump has a history of modifying his positions during the campaign, so he could change his stance again before or after taking office on Jan 20. One example of this is his changing position on prosecuting Hillary Clinton. During the campaign, Trump promised to prosecute Clinton over her use of a private email server and alleged abuses of her position. However, in a New York Times interview on Nov 22, Trump indicated that he no longer wanted to pursue prosecution, stating "I want to move forward, I don't want to move back." I have no intention of causing harm to the Clintons. I truly do not want to do so. However, when asked if he was completely ruling out the idea of investigating Clinton, he responded with a "no." Trump has dismissed climate change as a hoax, expressing a desire to withdraw the United States from the 2015 Paris Agreement involving nearly 200 nations. He plans to focus on developing affordable coal, shale, and oil instead. A source on Trump's transition team stated on Nov 12 that his advisers were exploring options to circumvent the four-year process for exiting the climate accord. When questioned in an interview with the Times on Nov 22 about whether he planned to remove America from the forefront of addressing climate change, Trump responded, "I am considering it. We will examine the issue closely." When asked if he believed human activity contributes to climate change, he acknowledged, "I believe there is a connection. There is some correlation." "It all depends on the amount." In the campaign, Trump promised to get rid of the Affordable Care Act implemented by President Obama, calling it a failure. He proposed replacing it with a plan that would give more power to states over Medicaid and allow insurers to sell plans nationwide. However, in a recent interview with the Wall Street Journal, Trump mentioned the possibility of keeping certain parts of the law, such as allowing parents to keep adult children on their insurance until age 26 and preventing insurers from denying coverage to those with pre-existing conditions. Trump stated that Obamacare will either be revised or repealed and replaced. During his campaign, Trump promised to build a wall along the US-Mexican border to reduce illegal immigration and have Mexico pay for it. He also discussed deporting millions of illegal immigrants and suggested a temporary ban on Muslims entering the country to address terrorism. Trump later adjusted his language, proposing a temporary suspension of immigration from regions considered to be exporting terrorism. In an interview with CBS' "60 Minutes," Trump confirmed his plan to build a wall, mentioning it could be a combination of wall and fence. He mentioned that he would use a fence in certain areas and a wall in others because he is skilled in construction. When asked about deporting illegal immigrants, he stated that the focus would be on those with criminal records, estimating there could be 2 to 3 million of them. Trump also expressed support for the use of waterboarding and other harsh interrogation techniques on terrorism suspects. During an interview with the New York Times on November 22, Trump mentioned being struck by Marine General James Mattis' response when asked about waterboarding. Mattis reportedly said that he would perform better with a pack of cigarettes and a couple of beers than with torture. Although Trump stated that this response did not change his opinion, he was impressed by the idea that waterboarding may not be as effective as some people believe.