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Here is the sentence that uses the words speculation and restrict in one sentence:
At last, there was a nice, solid brick wall, which would restrict more possibilities of chaos, ending speculation on this matter. 
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Answer:

In order to restrict the forms of speculations regarding that matter, the President decided to come forward and make a public statement.

Explanation:

The term speculation defines a series of conjectures, that may or may not be accurate according to facts. For Example: Many speculations have been made about how will Trump respond to recent outcomes of the war in Syria.

Additionally, the verb to restrict, means to limit, to minimize, to reduce.