There are two types of dollars in argentina (more if you want actually, but the 2 most important). The first one is the blue dollar that you know and the second is one that can be bought with bonds and stocks. This can be divided in two depending on the process used, CCL (contado con liqui, when a broker from the US is used) or Paridad (when you only use brokers in argentina). In few words, you buy a bond/stock in pesos and you sell it here or in the US in USD. These two can be bought legally if you have that money declared.
The government is using the Anses (agency for social security, retirement and other benefits) to sell the bonds and stocks that they have in their porftolio (that are used to do CCL/Paridad for other people) to lower it's price. This is causing a reaction in the market, generating the blue dollar to trade at a lower level cause this other one is cheaper. As you may imagine, this is a temporal solution because they have a limited amount of bonds/stocks to sell. They are just selling, selling and selling to keep the price at the current level.
In my opinion they are just stalling until elections. They are basically selling what they have to keep the price from touching the high values that we were seeing. Unless we discover gold, diamonds or oil.. the price will increase again in the future. But again, this is just my opinion.
Chris