Promulgated in November, the law stipulates that no public servant can earn more than the president.
Vowing to fight corruption and reduce inequality, Lopez Obrador has vowed to push through a raft of austerity measures. He has cut his own salary to 40 percent of what his predecessor earned, to 108,000 pesos ($5,331.36) per month.
However, opposition senators filed a challenge against the pay cut law, saying it violated the rights of public servants.
In granting the suspension, the court said in a statement the law could not be applied until a definitive ruling had been made. That complicates the government's first budget under Lopez Obrador, a veteran leftist who took office on Saturday.
The 2019 budget is due to be presented on December 15, meaning the government may have to revise its spending plans. ($1 = 20.2575 Mexican pesos) (Reporting by Dave Graham and Noe Torres; Editing by Diane Craft)
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