at making corruption more difficult. One example are two laws enacted that make corruption and voter fraud a criminal act without bail, as well as removing corrupt government officials with due process. López Obrador pledged a combination of zero tolerance and personal honesty to sweep it out "from top to bottom like cleaning the stairs." He asked international organizations to come to Mexico to help investigate cases of corruption and human rights abuses and announced a willingness to allow the creation of a body akin to the International Commission against Impunity in Guatemala, to help local prosecutors build graft cases. He also proposed to amend an article in the constitution to make it possible to try presidents for corruption. Energy López Obrador has had mixed views on the privatization of oil that was signed into law in 2013. He has called for a referendum over the 2013 energy reform () that ended Pemex's monopoly in the oil industry. , his top energy adviser, has called for a freeze on future deepwater drilling auctions and a review of contracts with international oil companies. In February 2018, his business adviser, Alfonso Romo, said, "[he] reviewed most of the oil tenders awarded to private drillers and found them to be beneficial for Mexico." He has also pledged to end oil exports to focus internally, as well as invest in refineries along with ending the importation of gasoline from the United States, saying the nation must recover energy self-sufficiency "as a principle of national security" and should make loss-making state refineries operable and assess biodiesel production. López Obrador has promised no more gasolinazos as well as no more hikes in electricity and gas prices. On 30 November 2018, López Obrador told the press that the previous administration's oil reforms, which permitted auctioning oil field rights to private companies, would not continue under his administration. Shortly after taking office, López Obrador cracked down on the robbery of motor fuels: Huachicolero. Despite the 18 January 2019 Tlahuelilpan pipeline explosion that cost the lives of at least 119 in Tlahuelilpan, Hidalgo, and local fuel shortages, gasoline theft was cut by 95% from 81,000 barrels in November 2018 to 4,000 barrels in April 2019 with a savings of 11 billion pesos ($581 million). By 2023 Mexico plans to have seven oil refineries, including a new one that is being built at the Dos Bocas port in Paraíso, Tabasco.