Florida Sen. Bill Nelson is calling on the federal government to help Puerto Rico address the fallout from Hurricane Maria, a Category 4 storm that hit the island more than four months ago.Nelson, a Democrat seeking re-election this year, and Republican Sen. Marco Rubio sent a letter to U.S. Attorney General Jeff Sessions on Feb. 1, encouraging federal justice officials to "engage with the Commonwealth of Puerto Rico to best determine how federal law enforcement can assist the territory in these trying times."The letter comes in the middle of reports of increased crime in Puerto Rico, which Nelson emphasized in a tweet accompanying news reports about the letter."Violent crime in Puerto Rico is on the rise as nearly one-third of the island remains without power," he tweeted on Feb. 2.We wondered if Nelsonís statistics about Puerto Ricoís storm recovery were accurate. Letís take a look.Nelsonís communication director Ryan Brown said the claim was in reference to recent news reports about an uptick in killings in January."If you look at Nelson and Rubioís letter, they clearly discuss the murder rate when discussing the increase in violent crime," he said. "But they also clearly cite recent media reports."Take, for example, the Associated Press article from Feb. 1. "One of Puerto Ricoís deadliest months in recent years has closed, with 78 killings reported in January as the U.S. territory struggles with a surge in violent crime and growing discontent among thousands of police officers," it reads. Thatís almost a 35 percent increase from the previous year at the same time. There were 58 recorded killings in January 2017, according to statistics from Gobierno de Puerto Rico Policia. In addition, the AP reported that Puerto Rico normally sees an average of 56 homicides a month in the last two years.The Associated Press reported that the uptick in killings came after increased dissatisfaction among thousands of police officers. In late December, police officers began calling in sick after the government fell behind on repaying millions of dollars worth of overtime following Hurricanes Irma and Maria.Nelson has a point about a recent uptick in killings, but he said "violent crime," which includes other crimes such as sexual assault, robberies and aggravated assault.The most recent data for violent crime we could find was from Gobierno de Puerto Rico Policia. The report compared the month of January 2017 to the month of January 2018 and showed that violent crime dropped 12 percent, from 716 incidents in January 2017, to 630 incidents in January 2018.But comparing violent crime from one point in 2017 to the same point in 2018 is not an apple-to-apples comparison, experts said. Hereís why:Hundreds of thousands of Puerto Ricans fled the island after Hurricane Maria. Itís hard to say exactly how many have left. University of Florida economists estimate the post-Maria moves to Florida are around 50,000 as of Jan. 6, according to an Orlando Sentinel article.Secondly, criminologists and experts familiar with the situation in Puerto Rico said itís possible that the number of recently reported violent crimes (outside of homicides and murders), might be an undercount."Homicides are reliably measured, but the measurement of other violent crimes depends on reports by the victim or someone else to the police," said Richard Rosenfeld, a professor of Criminology and Criminal Justice at the University of Missouri-St. Louis.Part of the reason itís difficult to track violent crime outside of murders has to do with the lack of power and resources on the island. Like Nelson accurately said, nearly one-third of the island remains without power.On Feb. 2, the acting executive director of the Puerto Rico Electric Power Authority, Justo L. GonzŠlez Torres, announced that a little more than 1 million or 70.92 percent of electric customers in Puerto Rico have power. That leaves about 450,000 customers (roughly one-third) still without power.With everything considered, we rate this claim Half True.Edited for print. Read the full version at PolitiFact.com/florida.